WO2010018507A1 - Method for communicating in a network, a secondary station and a system therefor - Google Patents

Method for communicating in a network, a secondary station and a system therefor Download PDF

Info

Publication number
WO2010018507A1
WO2010018507A1 PCT/IB2009/053470 IB2009053470W WO2010018507A1 WO 2010018507 A1 WO2010018507 A1 WO 2010018507A1 IB 2009053470 W IB2009053470 W IB 2009053470W WO 2010018507 A1 WO2010018507 A1 WO 2010018507A1
Authority
WO
WIPO (PCT)
Prior art keywords
station
status report
buffer status
secondary station
primary station
Prior art date
Application number
PCT/IB2009/053470
Other languages
French (fr)
Inventor
Paul Bucknell
Bernard Hunt
Matthew P.J. Baker
Timothy J. Moulsley
Original Assignee
Koninklijke Philips Electronics N.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=41168614&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2010018507(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Priority to KR1020177015672A priority Critical patent/KR101879450B1/en
Priority to EP09786852.5A priority patent/EP2314011B1/en
Priority to KR1020117005537A priority patent/KR101999852B1/en
Priority to JP2011522585A priority patent/JP2011530927A/en
Priority to US13/058,092 priority patent/US9198263B2/en
Priority to CN200980131247.4A priority patent/CN102119502B/en
Publication of WO2010018507A1 publication Critical patent/WO2010018507A1/en
Priority to US14/948,897 priority patent/US9954654B2/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1874Buffer management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/188Time-out mechanisms
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/189Transmission or retransmission of more than one copy of a message
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1867Arrangements specially adapted for the transmitter end
    • H04L1/1896ARQ related signaling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/0278Traffic management, e.g. flow control or congestion control using buffer status reports
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/04Wireless resource allocation
    • H04W72/044Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453Resources in frequency domain, e.g. a carrier in FDMA
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/12Wireless traffic scheduling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/21Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10Controlling the light source
    • H05B47/175Controlling the light source by remote control
    • H05B47/19Controlling the light source by remote control via wireless transmission
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W84/00Network topologies
    • H04W84/02Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04Large scale networks; Deep hierarchical networks
    • H04W84/042Public Land Mobile systems, e.g. cellular systems
    • H04W84/045Public Land Mobile systems, e.g. cellular systems using private Base Stations, e.g. femto Base Stations, home Node B
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40Control techniques providing energy savings, e.g. smart controller or presence detection

Definitions

  • the present invention relates to a method for communicating in a network comprising a primary station and at least one secondary station, and to such a secondary station. More specifically, this invention relates to a method for communicating in a mobile telecommunication network, like a GSM (Global System for Mobile communications) or a UMTS (Universal Mobile Telecommunications System) network.
  • GSM Global System for Mobile communications
  • UMTS Universal Mobile Telecommunications System
  • This invention is, for example, relevant for UMTS and UMTS Long Term Evolution, but as well to hubs which route calls from multiple terminals to base stations.
  • a primary station for instance a Node B (or Base Station or eNB) communicates with at least one secondary station, for instance a User Equipment (or Mobile Station), by means of a plurality of channels.
  • a secondary station In order to transmit data to the primary station, a secondary station needs to request a resource to the primary station, which is then allocated. This request of allocation can be made by several ways depending on the considered channel. In an example, in order to request a resource, it is required to indicate the amount of data to be transmitted, i.e. the data in the buffer of the secondary station. To this end, the secondary station transmits to the primary station a buffer status report indicative of the amount of data in the secondary station buffer. Thus, the primary station allocates a resource corresponding to both the capability of the network and the amount of data to be transmitted. This permits to adjust the allocation of resource.
  • a secondary station when a secondary station transmits this buffer status report, and receives no positive acknowledgement, it performs retransmission till reception of a positive acknowledgement or till the number of retransmissions reaches a maximum number. In the latter case, the secondary station has not been heard by the primary station and will not receive a resource grant for a long period. This leads to a significant delay, the secondary station no longer having any means to indicate its buffer status to the primary station.
  • a method for communicating in a network comprising at least one primary station communicating with at least one secondary station, comprising
  • a secondary station comprising means for communicating in a network comprising at least one primary station communicating with the secondary station, the secondary station comprising transmission means for transmitting to the primary station a buffer status report representative of the amount of data in a buffer of the secondary station, retransmission means for, in absence of acknowledgement from the primary station, retransmitting the buffer status report and, wherein the transmission means are arranged for, if a maximum number of retransmissions has been reached, sending a further buffer status report to the primary station.
  • a system of communication comprising at least one primary station communicating with at least one secondary station, the secondary station comprising transmission means for transmitting to the primary station a buffer status report representative of the amount of data in a buffer of the secondary station, retransmission means for, in absence of acknowledgement from the primary station, retransmitting the buffer status report and, wherein the transmission means are arranged for, if a maximum number of retransmissions has been reached, sending a further buffer status report to the primary station.
  • This second buffer status report may be of the same kind as the first status report, and even identical to the first report.
  • Fig. 1 is a block diagram of a system in which is implemented the invention.
  • Fig. 2 is a time chart illustrating the exchange of messages in accordance with a conventional technique.
  • - Fig. 3 is a time chart illustrated the exchange of messages in accordance with a method in accordance with an embodiment of the invention.
  • the present invention relates to a system of communication 300 as depicted on Figure 1, comprising a primary station 100, like a base station, and at least one secondary station 200 like a mobile station.
  • the radio system 300 may comprise a plurality of the primary stations 100 and/or a plurality of secondary stations 200.
  • the primary station 100 comprises a transmitter means 110 and a receiving means 120.
  • An output of the transmitter means 110 and an input of the receiving means 120 are coupled to an antenna 130 by a coupling means 140, which may be for example a circulator or a changeover switch.
  • Coupled to the transmitter means 110 and receiving means 120 is a control means 150, which may be for example a processor.
  • the secondary station 200 comprises a transmitter means 210 and a receiving means 220.
  • An output of the transmitter means 210 and an input of the receiving means 220 are coupled to an antenna 230 by a coupling means 240, which may be for example a circulator or a changeover switch.
  • a Buffer Status Report comprises the identity of a single group of logical channels, together with a 6-bit indicator of the amount of data corresponding to that group of logical channels currently residing in the secondary station's buffer awaiting transmission.
  • a long BSR comprises 4 concatenated short BSRs, each corresponding to a different group of logical channels.
  • a typical example is the uplink of the UMTS LTE, where the uplink transmissions from different secondary stations
  • the primary station or eNB
  • the eNB transmits a "scheduling grant" message to a UE, indicating a particular time- frequency resource for the UE 's transmission typically around 3ms after the transmission of the grant message.
  • the grant message also typically specifies the data rate and/or power to be used for the UE' s transmission.
  • the eNB In order for the eNB to issue appropriate grants, it needs to have sufficient information about the amount, type of data and the urgency of it awaiting transmission in the buffer of each UE. This information can be used to inform the scheduler in the eNB of either the satisfaction level of individual UEs or UEs whose service might be close to being dropped.
  • BSR buffer status report
  • a short BSR comprises the identity of a single group of logical channels, together with a 6-bit indicator of the amount of data corresponding to that group of logical channels currently residing in the UE's buffer awaiting transmission.
  • a long BSR comprises 4 concatenated short BSRs, each corresponding to a different group of logical channels. This is currently defined in 36.321 (as of June 2008) ⁇ 6.1.3.1 incorporated by reference.
  • BSR Buffer Status Reports
  • Regular BSR which is triggered only if Uplink data arrives in the UE transmission buffer and the data belongs to a logical channel with higher priority than those for which data already existed in the UE transmission buffer.
  • Periodic BSR which is triggered when the PERIODIC BSR TIMER expires. If the UE has no Uplink resources allocated for new transmission for this TTI and if a Regular BSR has been triggered since the last transmission of a BSR a Scheduling Request (SR) shall be triggered.
  • SR Scheduling Request
  • a BSR being "triggered” is not necessarily the same as transmitting a BSR.
  • the following sequence of steps can be identified: a) Data of higher priority arrives in UE buffer b) BSR is triggered c) No UL resources are allocated for this TTI, so a SR is triggered d) SR is transmitted e) UL grant should then be received f) Finally the BSR is actually transmitted.
  • the BSR mechanism has been designed so that only regular BSRs can trigger the sending of an SR if there are no UL resources available for the sending of the regular BSR.
  • the system may become overloaded with UEs sending SR, particularly if the UE has no PUCCH resources available, when an SR would require the sending of a RACH access.
  • an SR is considered pending and is repeated until UL-SCH resources are granted (i.e. for the sending of a BSR).
  • a problem with the BSR procedure defined above is that there is a possibility that the information that the network knows about the state of the buffers in the UE can be different to the actual state of the UE buffers. This can occur as detailed below:
  • BSRs are transported as MAC control elements that are subject to HARQ protocol. This means that an individual BSR may be delayed as the initial transmission may be not be received correctly by the eNB and one or more re-transmissions may be required. If the Maximum number of transmissions of a regular BSR is reached without the BSR being successfully received by the eNB then there is no way for the UE to recover from this as there is no trigger defined for the UE to send an SR or repeat again the failed BSR.
  • the disadvantage of this is that it requires periodic BSRs to be configured with a sufficiently short interval that the deadlock time is small, and this would increase the control signalling overhead as when data is present in the UL buffer, BSRs will be sent more often. Moreover, if the network does not allocate a grant for the configured periodic BSR, the periodic BSRs cannot be sent and the UE is also not allowed to generate an SR in such a case.
  • a Periodic BSR has been triggered since the last transmission of a BSR and the UE has data available for transmission, and the time since the transmission of the last BSR exceeds the BSR STALL AVOIDANCE timer then a Scheduling Request shall be triggered. This would solve the problem but only if periodic BSRs are configured.
  • the secondary station uplink data buffer is out of synchronization with the network view of the buffer.
  • a mechanism is proposed for a UE to send a buffer status report (BSR) when the transmission of a first buffer status report is not positively acknowledged by the network after a predetermined number of attempts.
  • BSR buffer status report
  • this UL grant is used to re-send the original BSR or an updated version of it.
  • a Scheduling request will be made to request UL resource in order to send the BSR and data.
  • the sending of the SR is conditional on no UL grant being received within a certain time window after e.g. the last transmission of the previous not-positively acknowledged BSR, or the time at which ACK was expected but not received.
  • the invention could be described by stating that a regular BSR is also triggered if a previous regular BSR is not positively acknowledged. Because of the way the triggers for SR are defined, this would also have the effect of triggering an SR if there was no UL grant in which to send the triggered BSR.
  • This invention may be implemented in mobile communication systems where communication devices utilize centralized scheduling, such as UMTS and LTE.
  • this invention could as well be implemented for hubs which route calls from multiple terminals to base stations. Such devices would appear like a secondary station from the point of view of the network.

Abstract

The present invention relates to a method for communicating in a network comprising at least one primary station communicating with at least one secondary station, comprising (a) the secondary station sending to the primary station a buffer status report representative of the amount of data in a buffer of the secondary station, (b) in absence of acknowledgement from the primary station, the secondary station retransmitting the buffer status report and, (c) if a maximum number of retransmissions has been reached, the secondary station sending a further buffer status report to the primary station.

Description

METHOD FOR COMMUNICATING IN A NETWORK, A SECONDARY STATION
AND A SYSTEM THEREFOR
FIELD OF THE INVENTION The present invention relates to a method for communicating in a network comprising a primary station and at least one secondary station, and to such a secondary station. More specifically, this invention relates to a method for communicating in a mobile telecommunication network, like a GSM (Global System for Mobile communications) or a UMTS (Universal Mobile Telecommunications System) network. This invention is, for example, relevant for UMTS and UMTS Long Term Evolution, but as well to hubs which route calls from multiple terminals to base stations.
BACKGROUND OF THE INVENTION
In a mobile telecommunication network like a UMTS system, a primary station, for instance a Node B (or Base Station or eNB) communicates with at least one secondary station, for instance a User Equipment (or Mobile Station), by means of a plurality of channels. In order to transmit data to the primary station, a secondary station needs to request a resource to the primary station, which is then allocated. This request of allocation can be made by several ways depending on the considered channel. In an example, in order to request a resource, it is required to indicate the amount of data to be transmitted, i.e. the data in the buffer of the secondary station. To this end, the secondary station transmits to the primary station a buffer status report indicative of the amount of data in the secondary station buffer. Thus, the primary station allocates a resource corresponding to both the capability of the network and the amount of data to be transmitted. This permits to adjust the allocation of resource.
However, in the current version of the specification, when a secondary station transmits this buffer status report, and receives no positive acknowledgement, it performs retransmission till reception of a positive acknowledgement or till the number of retransmissions reaches a maximum number. In the latter case, the secondary station has not been heard by the primary station and will not receive a resource grant for a long period. This leads to a significant delay, the secondary station no longer having any means to indicate its buffer status to the primary station. SUMMARY OF THE INVENTION
It is an object of the invention to propose a method enabling to alleviate this above problem.
It is another object of the invention to propose a secondary station which is able to keep the contact with the primary station.
To this end, in accordance with a first aspect of the invention, a method is proposed for communicating in a network comprising at least one primary station communicating with at least one secondary station, comprising
(a) the secondary station sending to the primary station a buffer status report representative of the amount of data in a buffer of the secondary station,
(b) in absence of acknowledgement from the primary station, the secondary station retransmitting the buffer status report and,
(c) if a maximum number of retransmissions has been reached, the secondary station sending a further buffer status report to the primary station. In accordance with a second aspect of the invention, a secondary station is proposed comprising means for communicating in a network comprising at least one primary station communicating with the secondary station, the secondary station comprising transmission means for transmitting to the primary station a buffer status report representative of the amount of data in a buffer of the secondary station, retransmission means for, in absence of acknowledgement from the primary station, retransmitting the buffer status report and, wherein the transmission means are arranged for, if a maximum number of retransmissions has been reached, sending a further buffer status report to the primary station.
In accordance with a third aspect of the invention, a system of communication is proposed comprising at least one primary station communicating with at least one secondary station, the secondary station comprising transmission means for transmitting to the primary station a buffer status report representative of the amount of data in a buffer of the secondary station, retransmission means for, in absence of acknowledgement from the primary station, retransmitting the buffer status report and, wherein the transmission means are arranged for, if a maximum number of retransmissions has been reached, sending a further buffer status report to the primary station.
As a consequence, if a secondary station arrives in the state where it has reached for instance the maximum number of retransmissions, it can again request a resource by sending another buffer status report. This second buffer status report may be of the same kind as the first status report, and even identical to the first report. These and other aspects of the invention will be apparent from and will be elucidated with reference to the embodiments described hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS The present invention will now be described in more detail, by way of example, with reference to the accompanying drawings, wherein:
Fig. 1 is a block diagram of a system in which is implemented the invention. Fig. 2 is a time chart illustrating the exchange of messages in accordance with a conventional technique. - Fig. 3 is a time chart illustrated the exchange of messages in accordance with a method in accordance with an embodiment of the invention.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a system of communication 300 as depicted on Figure 1, comprising a primary station 100, like a base station, and at least one secondary station 200 like a mobile station.
The radio system 300 may comprise a plurality of the primary stations 100 and/or a plurality of secondary stations 200. The primary station 100 comprises a transmitter means 110 and a receiving means 120. An output of the transmitter means 110 and an input of the receiving means 120 are coupled to an antenna 130 by a coupling means 140, which may be for example a circulator or a changeover switch. Coupled to the transmitter means 110 and receiving means 120 is a control means 150, which may be for example a processor. The secondary station 200 comprises a transmitter means 210 and a receiving means 220. An output of the transmitter means 210 and an input of the receiving means 220 are coupled to an antenna 230 by a coupling means 240, which may be for example a circulator or a changeover switch. Coupled to the transmitter means 210 and receiving means 220 is a control means 250, which may be for example a processor. Transmission from the primary radio station 100 to the secondary station 200 takes place on a downlink channel 160 and transmission from the secondary radio station 200 to the first radio station 100 takes place on an uplink channel 260.
From time to time, the secondary station 200 transmits on the uplink channel 260 an indication of the status of its buffer containing data to be transmitted. This Buffer Status Report can be of different types. A short Buffer Status Report (BSR) comprises the identity of a single group of logical channels, together with a 6-bit indicator of the amount of data corresponding to that group of logical channels currently residing in the secondary station's buffer awaiting transmission. A long BSR comprises 4 concatenated short BSRs, each corresponding to a different group of logical channels.
Many communication systems operate using a centralised scheduler which is responsible for allocating transmission resources to different nodes. A typical example is the uplink of the UMTS LTE, where the uplink transmissions from different secondary stations
(or UEs) are scheduled in time and frequency by the primary station (or eNB); the eNB transmits a "scheduling grant" message to a UE, indicating a particular time- frequency resource for the UE 's transmission typically around 3ms after the transmission of the grant message. The grant message also typically specifies the data rate and/or power to be used for the UE' s transmission.
In order for the eNB to issue appropriate grants, it needs to have sufficient information about the amount, type of data and the urgency of it awaiting transmission in the buffer of each UE. This information can be used to inform the scheduler in the eNB of either the satisfaction level of individual UEs or UEs whose service might be close to being dropped.
In LTE, a number of different types of buffer status report (BSR) messages are therefore defined, which may be transmitted from a UE to the eNB when certain triggers occur. The state of the art in this respect is defined by the current version of 3GPP TS36.321 (as of June 2008) §5.4.5, incorporated by reference.
A short BSR comprises the identity of a single group of logical channels, together with a 6-bit indicator of the amount of data corresponding to that group of logical channels currently residing in the UE's buffer awaiting transmission. A long BSR comprises 4 concatenated short BSRs, each corresponding to a different group of logical channels. This is currently defined in 36.321 (as of June 2008) §6.1.3.1 incorporated by reference.
As detailed in this specification, there are two main types of Buffer Status Reports (BSR) with different characteristics.
Regular BSR which is triggered only if Uplink data arrives in the UE transmission buffer and the data belongs to a logical channel with higher priority than those for which data already existed in the UE transmission buffer.
Periodic BSR which is triggered when the PERIODIC BSR TIMER expires. If the UE has no Uplink resources allocated for new transmission for this TTI and if a Regular BSR has been triggered since the last transmission of a BSR a Scheduling Request (SR) shall be triggered.
A BSR being "triggered" is not necessarily the same as transmitting a BSR. For example, in the case above, the following sequence of steps can be identified: a) Data of higher priority arrives in UE buffer b) BSR is triggered c) No UL resources are allocated for this TTI, so a SR is triggered d) SR is transmitted e) UL grant should then be received f) Finally the BSR is actually transmitted.
The BSR mechanism has been designed so that only regular BSRs can trigger the sending of an SR if there are no UL resources available for the sending of the regular BSR.
When a periodic BSR is triggered and there is no UL resource allocated then the UE cannot send SR, as it is assumed that the network knows that the UE has data available and is deliberately not allocating any UL resources for the UE to use.
If the triggering of a periodic BSR were allowed to trigger an SR in the case of no UL resource being available for the sending of the BSR then the system may become overloaded with UEs sending SR, particularly if the UE has no PUCCH resources available, when an SR would require the sending of a RACH access.
Also, an SR is considered pending and is repeated until UL-SCH resources are granted (i.e. for the sending of a BSR).
A problem with the BSR procedure defined above is that there is a possibility that the information that the network knows about the state of the buffers in the UE can be different to the actual state of the UE buffers. This can occur as detailed below:
BSRs are transported as MAC control elements that are subject to HARQ protocol. This means that an individual BSR may be delayed as the initial transmission may be not be received correctly by the eNB and one or more re-transmissions may be required. If the Maximum number of transmissions of a regular BSR is reached without the BSR being successfully received by the eNB then there is no way for the UE to recover from this as there is no trigger defined for the UE to send an SR or repeat again the failed BSR.
This is what is illustrated on Figure 2, where the BSR sent by the secondary station is lost since it has reached the maximum number of retransmissions. The problem is that if that first BSR is lost then there is no way to generate a subsequent SR to obtain uplink resources (because unless data of even higher priority arrives in the buffer, the data currently in the buffer does not trigger another regular BSR and hence an SR) and a deadlock situation would arise. One possible solution involves configuring periodic BSRs. If a periodic BSR is configured and the initial BSR is lost then this "lost" BSR will be sent in the first configured UL resource for the periodic BSR. The disadvantage of this is that it requires periodic BSRs to be configured with a sufficiently short interval that the deadlock time is small, and this would increase the control signalling overhead as when data is present in the UL buffer, BSRs will be sent more often. Moreover, if the network does not allocate a grant for the configured periodic BSR, the periodic BSRs cannot be sent and the UE is also not allowed to generate an SR in such a case.
A solution could also be proposed allowing the periodic BSR to generate an SR but only for a configurable amount of time. Thus the following condition: if a Periodic BSR has been triggered since the last transmission of a BSR and the UE has data available for transmission, and the time since the transmission of the last BSR exceeds the BSR STALL AVOIDANCE timer then a Scheduling Request shall be triggered. This would solve the problem but only if periodic BSRs are configured.
In cases described above the secondary station uplink data buffer is out of synchronization with the network view of the buffer.
In accordance with a first aspect of the invention, a mechanism is proposed for a UE to send a buffer status report (BSR) when the transmission of a first buffer status report is not positively acknowledged by the network after a predetermined number of attempts.
This will be known by the secondary station for instance, as the maximum number of HARQ transmissions for the BSR has occurred without the MAC packet containing the BSR being positively acknowledged by the network.
According to one embodiment of the invention, if the secondary station receives a UL grant after the previous BSR has not been positively acknowledged, this UL grant is used to re-send the original BSR or an updated version of it. According to a variant of this embodiment of the invention, if a previous BSR has not been positively acknowledged then a Scheduling request will be made to request UL resource in order to send the BSR and data. In some embodiments the sending of the SR is conditional on no UL grant being received within a certain time window after e.g. the last transmission of the previous not-positively acknowledged BSR, or the time at which ACK was expected but not received.
In other words, the invention could be described by stating that a regular BSR is also triggered if a previous regular BSR is not positively acknowledged. Because of the way the triggers for SR are defined, this would also have the effect of triggering an SR if there was no UL grant in which to send the triggered BSR.
On Figure 3, it is illustrated that if a BSR is lost, the whole process can be reinitiated, with the sending of an SR. In accordance with a variant of this embodiment, if some resource is allocated to the secondary station, it is possible to skip the first step (sending of an SR) and use directly this granted resource to send a BSR along with data.
This invention may be implemented in mobile communication systems where communication devices utilize centralized scheduling, such as UMTS and LTE.
Moreover, this invention could as well be implemented for hubs which route calls from multiple terminals to base stations. Such devices would appear like a secondary station from the point of view of the network.
In the present specification and claims the word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. Further, the word "comprising" does not exclude the presence of other elements or steps than those listed.
The inclusion of reference signs in parentheses in the claims is intended to aid understanding and is not intended to be limiting.
From reading the present disclosure, other modifications will be apparent to persons skilled in the art. Such modifications may involve other features which are already known in the art of radio communication and the art of transmitter power control and which may be used instead of or in addition to features already described herein.

Claims

1. A method for communicating in a network comprising at least one primary station communicating with at least one secondary station, comprising (a) the secondary station sending to the primary station a buffer status report representative of the amount of data in a buffer of the secondary station,
(b) in absence of acknowledgement from the primary station, the secondary station retransmitting the buffer status report and,
(c) if a maximum number of retransmissions has been reached, the secondary station sending a further buffer status report to the primary station.
2. The method of claim 1, wherein the further buffer status report of step (c) is a scheduling request indicative that there is data to be transmitted in the secondary station buffer.
3. The method of claim 2, wherein the scheduling request is sent if no resource grant indicative of an allocated resource is received within a time window after step (c).
4. The method of claim 3, wherein the time window starts from the instant an acknowledgement from the primary station was expected.
5. The method of claim 1, wherein if the secondary station receives from the primary station a resource grant indicative of an allocated resource after step (b), the further buffer status report of step (c) is transmitted in the allocated resource.
6. The method of claim 5, wherein the further buffer status report is of the same type of the buffer status report of step (a).
7. The method of claim 6, wherein the further buffer status report is an update of the buffer status report of step (a).
8. The method of claim 6, wherein the further buffer status report is identical to the buffer status report of step (a).
9. A secondary station comprising means for communicating in a network comprising at least one primary station communicating with the secondary station, the secondary station comprising transmission means for transmitting to the primary station a buffer status report representative of the amount of data in a buffer of the secondary station, retransmission means for, in absence of acknowledgement from the primary station, retransmitting the buffer status report and, wherein the transmission means are arranged for, if a maximum number of retransmissions has been reached, sending a further buffer status report to the primary station.
10. A system of communication comprising at least one primary station communicating with at least one secondary station, the secondary station comprising transmission means for transmitting to the primary station a buffer status report representative of the amount of data in a buffer of the secondary station, retransmission means for, in absence of acknowledgement from the primary station, retransmitting the buffer status report and, wherein the transmission means are arranged for, if a maximum number of retransmissions has been reached, sending a further buffer status report to the primary station.
PCT/IB2009/053470 2008-08-11 2009-08-07 Method for communicating in a network, a secondary station and a system therefor WO2010018507A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
KR1020177015672A KR101879450B1 (en) 2008-08-11 2009-08-07 Method for communicating in a network, a secondary station and a system therefor
EP09786852.5A EP2314011B1 (en) 2008-08-11 2009-08-07 Method for communicating in a network, a secondary station and a system therefor
KR1020117005537A KR101999852B1 (en) 2008-08-11 2009-08-07 Method for communicating in a network, a secondary station and a system therefor
JP2011522585A JP2011530927A (en) 2008-08-11 2009-08-07 Method for communicating over network, secondary station and system
US13/058,092 US9198263B2 (en) 2008-08-11 2009-08-07 Method for communicating a network, a secondary station and a system therefor
CN200980131247.4A CN102119502B (en) 2008-08-11 2009-08-07 Method for communicating in a network, a secondary station and a system therefor
US14/948,897 US9954654B2 (en) 2008-08-11 2015-11-23 Method for communicating a network, a secondary station and a system therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP08300255 2008-08-11
EP08300255.0 2008-08-11

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US13/058,092 A-371-Of-International US9198263B2 (en) 2008-08-11 2009-08-07 Method for communicating a network, a secondary station and a system therefor
US14/948,897 Continuation US9954654B2 (en) 2008-08-11 2015-11-23 Method for communicating a network, a secondary station and a system therefor

Publications (1)

Publication Number Publication Date
WO2010018507A1 true WO2010018507A1 (en) 2010-02-18

Family

ID=41168614

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2009/053470 WO2010018507A1 (en) 2008-08-11 2009-08-07 Method for communicating in a network, a secondary station and a system therefor

Country Status (6)

Country Link
US (2) US9198263B2 (en)
EP (1) EP2314011B1 (en)
JP (2) JP2011530927A (en)
KR (2) KR101999852B1 (en)
CN (1) CN102119502B (en)
WO (1) WO2010018507A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014085192A1 (en) * 2012-11-27 2014-06-05 Qualcomm Incorporated Buffer size reporting in time division high speed uplink packet access (td-hsupa) systems
EP2701427B1 (en) * 2011-04-22 2018-05-30 NTT DoCoMo, Inc. Mobile communication method, radio base station, and mobile station

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102355336B (en) * 2011-07-21 2017-05-10 中兴通讯股份有限公司 Buffer status report (BSR) triggering method, device and user equipment
US20130039192A1 (en) * 2011-08-08 2013-02-14 Renesas Mobile Corporation Methods, Apparatus and Wireless Device for Transmitting and Receiving Data Blocks
EP2661138A1 (en) 2012-05-04 2013-11-06 Panasonic Corporation Threshold-based and power-efficient scheduling request procedure
CN103828411B (en) * 2012-09-17 2018-06-15 华为技术有限公司 Dispatching method, base station, user equipment and system
US9999033B2 (en) 2013-07-29 2018-06-12 Lg Electronics Inc. Method for calculating and reporting a buffer status and device therefor
EP3244680B1 (en) * 2015-01-29 2019-12-04 Huawei Technologies Co., Ltd. Data transmission method and device
WO2017197647A1 (en) * 2016-05-20 2017-11-23 华为技术有限公司 Method, apparatus and system for triggering scheduling request
US10721755B2 (en) * 2017-06-15 2020-07-21 Ofinno, Llc Grant free for large data size
EP3689058A4 (en) * 2017-09-28 2021-05-05 Nokia Technologies Oy Method, apparatus, computer program product and computer program
WO2023211015A1 (en) * 2022-04-27 2023-11-02 엘지전자 주식회사 Method for transmitting and receiving uplink channel and downlink channel, and device therefor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007148881A2 (en) * 2006-06-21 2007-12-27 Lg Electronics Inc. Method of supporting data retransmission in a mobile communication system

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100525384B1 (en) * 2000-10-31 2005-11-02 엘지전자 주식회사 Method for controlling packet retransmission in mobile communication system
JP3912091B2 (en) * 2001-12-04 2007-05-09 ソニー株式会社 Data communication system, data transmission apparatus, data reception apparatus and method, and computer program
BR0318338A (en) * 2003-06-10 2006-07-11 Nokia Corp method and apparatus for switching the mobile station between autonomous and programmed transmissions
KR100678184B1 (en) * 2004-05-19 2007-02-02 삼성전자주식회사 Method and?apparatus?for scheduling of enhanced uplink dedicated channel in a mobile telecommunication system
KR20060013466A (en) * 2004-08-07 2006-02-10 삼성전자주식회사 Method for signaling of mobile status information in soft handoff area for uplink packet transmission
KR100929082B1 (en) * 2005-10-12 2009-11-30 삼성전자주식회사 Method and apparatus for transmitting / receiving control information of terminal for reverse data transmission
KR100886536B1 (en) * 2006-06-22 2009-03-02 삼성전자주식회사 Method and Apparatus for Scheduling Request Transmission in Mobile Communication System
US20080045255A1 (en) * 2006-08-21 2008-02-21 Motorola, Inc. Method of transmitting scheduling information by a wireless communication device and a wireless communication device
EP2082499B1 (en) 2006-11-15 2014-09-10 Samsung Electronics Co., Ltd. Method and apparatus for buffer status report in mobile communication system
US8432883B2 (en) * 2007-03-01 2013-04-30 Ntt Docomo, Inc. Base station apparatus and communication control method
US8526373B2 (en) * 2007-03-01 2013-09-03 Ntt Docomo, Inc. Base station apparatus and communication control method for radio resource allocation
KR101007824B1 (en) * 2007-05-02 2011-01-13 삼성전자주식회사 Apprautus and method for transmitting and receinving packet data between a base station and a user equipment using hybrid auto repeat request in a mobile communicatio system
JP5102356B2 (en) * 2007-06-19 2012-12-19 テレフオンアクチーボラゲット エル エム エリクソン(パブル) Method and system for resource scheduling in a telecommunications system
KR100937432B1 (en) * 2007-09-13 2010-01-18 엘지전자 주식회사 Method of allocating radio resources in a wireless communication system
DK2274850T3 (en) * 2008-04-30 2012-02-06 Koninkl Philips Electronics Nv Method of communication in a network and radio stations thereto
US8803961B2 (en) 2008-05-27 2014-08-12 Capso Vision, Inc. Multi-stream image decoding apparatus and method
JP5632834B2 (en) * 2008-06-23 2014-11-26 コーニンクレッカ フィリップス エヌ ヴェ Method for communicating over a network and associated radio station
KR100939722B1 (en) * 2008-08-11 2010-02-01 엘지전자 주식회사 Data transmission method and user equipment for the same
CN102119511B (en) * 2008-08-11 2016-08-03 皇家飞利浦电子股份有限公司 For the method communicated in a network and for its secondary and system
WO2011001330A1 (en) * 2009-06-29 2011-01-06 Koninklijke Philips Electronics N.V. A method for communicating in a network

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007148881A2 (en) * 2006-06-21 2007-12-27 Lg Electronics Inc. Method of supporting data retransmission in a mobile communication system

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
3GPP: "Evolved Universal Terrestrial Radio Access (E-UTRA) Medium Access Control (MAC) protocol specification", 4 June 2008 (2008-06-04), XP002551801, Retrieved from the Internet <URL:http://www.arib.or.jp/IMT-2000/V700Sep08/5_Appendix/Rel8/36/36321-820.pdf> [retrieved on 20091020] *
ERICSSON: "Robustness of Buffer Status Reporting", 24 June 2008 (2008-06-24), XP002551799, Retrieved from the Internet <URL:http://www.3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_62bis/Docs/R2-083149.zip> [retrieved on 20091020] *
ERICSSON: "Robustness of Buffer Status Reporting", TSG RAN2 3GPP
PHILIPS, NXP SEMICONDUCTORS: "Improving the Robustness of Buffer Status Reporting", 11 August 2008 (2008-08-11), XP002551800, Retrieved from the Internet <URL:http://3gpp.org/ftp/tsg_ran/WG2_RL2/TSGR2_63/Docs/R2-084090.zip> [retrieved on 20091020] *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2701427B1 (en) * 2011-04-22 2018-05-30 NTT DoCoMo, Inc. Mobile communication method, radio base station, and mobile station
US9999031B2 (en) 2011-04-22 2018-06-12 Ntt Docomo, Inc. Mobile communication method, radio base station, and mobile station
WO2014085192A1 (en) * 2012-11-27 2014-06-05 Qualcomm Incorporated Buffer size reporting in time division high speed uplink packet access (td-hsupa) systems
CN104823504A (en) * 2012-11-27 2015-08-05 高通股份有限公司 Buffer size reporting in time division high speed uplink packet access (TD-HSUPA) systems

Also Published As

Publication number Publication date
JP2011530927A (en) 2011-12-22
EP2314011B1 (en) 2016-06-22
CN102119502B (en) 2014-07-16
JP2015156701A (en) 2015-08-27
US9954654B2 (en) 2018-04-24
US9198263B2 (en) 2015-11-24
KR101999852B1 (en) 2019-07-15
KR101879450B1 (en) 2018-07-18
JP6073402B2 (en) 2017-02-01
US20110143801A1 (en) 2011-06-16
KR20110053999A (en) 2011-05-24
KR20170068628A (en) 2017-06-19
US20160080116A1 (en) 2016-03-17
EP2314011A1 (en) 2011-04-27
CN102119502A (en) 2011-07-06

Similar Documents

Publication Publication Date Title
US9954654B2 (en) Method for communicating a network, a secondary station and a system therefor
US9877201B2 (en) Method for communicating in a network, a secondary station and a system therefor
JP5632834B2 (en) Method for communicating over a network and associated radio station
EP2314028B1 (en) Method for communicating in a network, a secondary station and a system therefor
US20110151883A1 (en) Method for communicating in a network, a secondary station and a system therefor
WO2022152546A1 (en) Communications device, infrastructure equipment and methods

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200980131247.4

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 09786852

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2009786852

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 13058092

Country of ref document: US

ENP Entry into the national phase

Ref document number: 2011522585

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 1557/CHENP/2011

Country of ref document: IN

ENP Entry into the national phase

Ref document number: 20117005537

Country of ref document: KR

Kind code of ref document: A