WO2011157079A1

WO2011157079A1 - Method and system for uplink feedback

Info

Publication number: WO2011157079A1
Application number: PCT/CN2011/073253
Authority: WO
Inventors: 马子江; 毛磊; 王斌
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-06-13
Filing date: 2011-04-25
Publication date: 2011-12-22
Also published as: CN102281504A

Abstract

A method for uplink feedback is provided in the present invention. The method includes: in the uplink feedback signaling sent from a network side to a User Equipment (UE), there is indicator information, which is newly added, for identifying the feedback procedure. A system for uplink feedback is further provided in the present invention. The system includes a transmitting unit (20) for transmitting an uplink feedback signaling to a UE; in the uplink feedback signaling, there is indicator information, which is newly added, for identifying the feedback procedure. By applying the technical solution of the present invention, after receiving an uplink feedback signaling, a UE can uniquely determine, according to the identifier information of Multimedia Broadcast Multicast Service (MBMS) and the indicator information in the uplink feedback signaling, the uplink feedback signaling. Even an uplink feedback signaling is sent multiple times during the same feedback produce, the UE can be ensured to feed back only once. The present invention prevents a UE from feeding back multiple times during the same feedback procedure, thus preventing the network side from making a mistaken decision due to the inaccurate statistic information made by itself.

Description

Method and system for uplink feedback

The present invention relates to an uplink feedback technology in a Multimedia Broadcast Multicast Service (MBMS) system, and more particularly to a method and system for uplink feedback in an MBMS system. Background technique

With the rapid development of the Internet and the popularity of large-screen multi-function mobile terminals, a large number of mobile data multimedia services and various high-bandwidth multimedia services, such as video conferencing, television broadcasting, video on demand, advertising, online education, interactive games, etc., have emerged. This aspect meets the needs of mobile users for multiple services, and also brings new business growth points for mobile operators. These mobile data multimedia services require multiple users to receive the same data at the same time. Compared with general data services, they have the characteristics of large data volume, long duration, and delay sensitivity.

In order to effectively utilize mobile network resources, the 3rd Generation Partnership Project (3GPP) proposes an MBMS service, which is a technology for transmitting data from one data source to multiple target mobile terminals. The sharing of resources (including core network and access network) improves the utilization of network resources, especially air interface resources. The MBMS defined by MBS can not only realize the multicast and broadcast of plain text low-rate message classes, but also realize the broadcast and multicast of high-speed multimedia services, providing a variety of rich video, audio and multimedia services, which undoubtedly conforms. The trend of future mobile data development provides a better business prospect for the development of third-generation (3G, 3rd Generation) communications.

In 3GPP Release 9, a single-frequency network (MBSFN, Multimedia Broadcast multicast service Single Frequency Network) transmission mode is designed to transmit MBMS services. MBSFN transmission mode is the same by synchronous transmission on the same physical resource of multiple co-frequency cells The signal (MBMS control signaling and service data) is such that the user equipment (UE, User Equipment) receiving the MBMS service receives the enhanced signals after the multiple cells are superimposed to improve the signal reception quality of the UE.

The characteristics of MBSFN transmission are as follows:

1) synchronous transmission in the MBSFN area; 2) support multi-cell MBMS service transmission and combination;

3) Multicast Traffic Channel (MTCH) and Multicast Control Channel (MCCH) are mapped to the Multicast Channel (MCH, Multicast Channel) in point-to-multipoint (pTm) mode; 4) The MBSFN synchronization area, MBSNF area, MBSFN transmission, advertisement, and reserved cell are all semi-statically configured by operation and maintenance.

The UEs of the multiple cells can receive multiple MBMS data with the same content and perform single frequency network (SFN) merging, so that the gain of the received signal can be improved. Multiple cells that use the same physical resource and transmit the same MBMS service in MBSFN transmission mode constitute an MBSFN area i or .

In the actual LTE (Long Term Evolution) system networking, there are several MBSFN services in an MBSFN area. All MBSFN services belonging to the same MBSFN area are called an MBSFN service group, that is, one MBSFN service. The group belongs to only one MBSFN area. An MBSFN area includes multiple cells, and each cell is configured with the same MBSFN service group. The data channel MTCH of multiple MBSFN services having the same MBSFN area, and the control channel MCCH of the MBSFN service can be multiplexed into one MCH. The MCCH and multiple MTCHs of the same MBSFN area, that is, multiple logical channels can be mapped to the same transport channel MCH.

In order to further reduce the power consumption caused by the UE periodically reading the MCCH signaling content, the LTE system simultaneously proposes an MBMS Notification (MBMS Notification) mechanism, and uses physical layer signaling to indicate whether the MCCH information will occur. change. The UE only needs to listen to the MBMS notification indication, and then decide according to the content indicated by the MBMS notification. Whether to receive MCCH information.

The physical downlink control information (specifically, PDCCH format 1C) in the Physical Downlink Control Channel (PDCCH) is allocated 8 bits, and each bit corresponds to one MCCH, and the MCCH belongs to a specific MBSFN area. In the MBSFN area, a session start process will occur, and the corresponding bit position will be triggered, that is, the corresponding bit position is 1. The 8 bits are reserved for MBMS notification. Even if the MBSFN area configured in the cell is less than 8, the remaining bits are not used for other purposes (can be configured as invalid values or 0). In the system broadcast message, the UE is informed which MBSFN area corresponds to which bit, because one MBSFN area informs the UE of one MCCH corresponding to each of the 8 bits in the PDCCH format 1C for one MCCH, that is, in the system broadcast message. Notification. For example: {bit0, bitl, bit2, ...bit7} correspond to {MCCHO, MCCH1, MCCH2, ....MCCH7} respectively.

When the UE is interested in the MBMS service of a certain MBSFN area, the UE monitors the MBMS notification indication information. Further, the UE may only judge the notification bit corresponding to the MBSFN area of interest. Once the UE detects that the notification bit of interest is set, the UE will read the updated MCCH content when the notification bit corresponds to the MCCH tampering period. The UE may only care about the partial MBSFN area i or the corresponding MCCH content change, and the content of the MCCH corresponding to the MBSFN area is to be changed according to the configured notification bit corresponding to the MBSFN area, and is repeated according to the modification period of the MCCH. Cycle to read the contents of the MCCH.

The PDCCH format 1C carrying the MBMS notification indication information is identified by an MBMS-Radio Network Tempory Indication (M-RNTI, MBMS-Radio Network Tempory Indication), which is located in a common search space of the subframe control domain.

The MBMS notification indication information is carried in the MBSFN subframe. If the MBMS notification indication information has content update, the MBMS notification indication will be sent periodically. Each MCCH has its own modification period, and the MBMS notification indication information transmission period is related to the MCCH modification period. The MBMS notification indication information may be repeatedly transmitted multiple times (specifically 2 or 4 times) during the shortest MCCH modification period. If there is no session start (MBMS service initiation) process in the service of any MBSFN area in the next shortest MCCH modification period, that is, if no bit is set in the notification indication information, the notification indication information is in the shortest MCCH. The PDCCH format 1C identified by the M-RNTI is not carried in the common search space of the subframe control domain.

FIG. 1 is a schematic diagram of notification transmission in the case of only one MCCH. As shown in FIG. 1, a notification transmission situation in the case where there is only one MCCH is shown, and the MBSFN area is within the MCCH modification period n+1. If there is a service to be initiated, within the MCCH modification period n, the MBMS notification will be sent, where the corresponding bit position starts.

The UE periodically monitors the MBMS notification indication information according to the configured MCCH modification period and the MBMS notification indication information transmission times, subframe position and the like. Determine whether the specific MAC address in the MBMS Notification is set to determine whether to trigger the reading of the corresponding MCCH, obtain the service information (including the service identifier, service configuration information) configured in the MCCH, and further determine whether the service is a service that is of interest to the user, and determine Whether to receive the service.

In the Release 9 version of MBMS, user uplink feedback is not supported, and uplink feedback is designed in ReleaselO. The general process is that the network sends uplink feedback signaling according to requirements, and after receiving the uplink feedback signaling, the UE sends feedback information to the network according to the signaling; the network determines further actions according to the collected information. For example, the network wants to count whether a user is interested in a certain service in the cell, and sends a signaling request to the user who is interested in the service. If no feedback is received from the user during the feedback period, the network knows that no user is willing to Receiving the service, the service can no longer be transmitted.

In order to ensure that the statistics are relatively accurate, the network generally sends feedback signaling continuously for a certain period of time, so that users can be dispersed in different subframes for feedback, so as to avoid the impact of multiple users simultaneously feeding back. When the network repeatedly sends user feedback signaling for a period of time to collect information about users in the time period, some users may feedback relevant information at the beginning of receiving user feedback signaling, but receive it again in the subsequent period. The user feeds back the signaling and feeds back the relevant information again. This will result in inaccurate information on the network statistics. There is an urgent need to design a mechanism to avoid the problem of users sending feedback multiple times for the same feedback signaling. Summary of the invention

In view of this, the main purpose of the present invention is to provide a method and system for uplink feedback, which can ensure that the UE only feeds back once when receiving multiple uplink feedback signaling of the same feedback process.

In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A method for uplink feedback, including:

The uplink feedback signaling sent by the network to the UE is further provided with indication information that identifies the uplink feedback process.

Preferably, the method further includes:

After receiving the uplink feedback signaling, the UE determines whether the currently received uplink feedback signaling is the same as the received uplink feedback signaling, and discards the current uplink feedback signaling when the same, otherwise, according to the received uplink feedback signaling. Perform upstream feedback.

Preferably, the indication information uniquely identifies an uplink feedback procedure for the same MBMS service.

Preferably, the uplink feedback signaling further includes MBMS service identification information and feedback content information;

The determining whether the currently received uplink feedback signaling is the same as the received uplink feedback signaling is:

The UE compares the currently received indication information of the uplink feedback signaling and the MBMS service identification information with the received indication information of the uplink feedback signaling and the MBMS service identification information, and determines the currently received uplink feedback signaling when they are all the same. Same as received uplink feedback signaling, no It is not the same.

Preferably, the received uplink feedback signaling is uplink feedback signaling received by the UE within a set period before receiving the current uplink feedback signal.

Preferably, the method further includes:

The UE obtains feedback information according to the indication of the feedback content in the uplink feedback signaling, and feeds back the feedback information to the network side, and feeds back the indication information of the uplink feedback signaling corresponding to the feedback information. Give the network side.

A system for uplink feedback, including:

And a sending unit, configured to send uplink feedback signaling to the UE, where the uplink feedback signaling is provided with indication information that identifies an uplink feedback process.

Preferably, the system further includes a receiving unit, a determining unit, a discarding unit, and a feedback unit;

a receiving unit, configured to receive uplink feedback signaling sent by the sending unit;

a determining unit, configured to determine whether the uplink feedback signaling received by the receiving unit is the same as the received uplink feedback signaling, and trigger the discarding unit when the same; otherwise, triggering the feedback unit;

a discarding unit, configured to discard current uplink feedback signaling;

And a feedback unit, configured to perform uplink feedback according to the received uplink feedback signaling.

The determining unit further compares the currently received indication information of the uplink feedback signaling and the MBMS service identification information with the received indication information of the uplink feedback signaling and the MBMS service identification information, and determines the currently received uplink feedback when they are all the same. The signaling is the same as the received uplink feedback signaling, otherwise it is not the same. Preferably, the received uplink feedback signaling is uplink feedback signaling received within a set period before the current uplink feedback signaling is received.

Preferably, the feedback unit further obtains feedback information according to the indication of the feedback content in the uplink feedback signaling, and feeds the feedback information to the network side, and the uplink feedback signaling corresponding to the feedback information. The indication information is fed back to the network side.

In the present invention, when the network side determines that the UE in the MBSFN needs to perform uplink feedback, when the uplink feedback signaling is sent to the UE in the MBSFN, the uplink feedback signaling is added with indication information indicating the uplink feedback process; After receiving the uplink feedback signaling, the uplink feedback signaling can be uniquely determined according to the MBMS service identification information and the indication information in the uplink feedback signaling. Even if the uplink feedback signaling in the same feedback process is sent multiple times, the UE can only ensure feedback. once. The invention avoids multiple feedbacks of the UE in the same feedback process, thereby avoiding inaccurate information on the network side and making erroneous decisions. DRAWINGS

Figure 1 is a schematic diagram of notification transmission in the case of only one MCCH;

2 is a schematic structural diagram of a first embodiment of a system for uplink feedback according to the present invention;

FIG. 3 is a schematic structural diagram of a second embodiment of a system for uplink feedback according to the present invention. detailed description

The basic idea of the present invention is that when the network side determines that the UE in the MBSFN needs to perform uplink feedback, when the uplink feedback signaling is sent to the UE in the MBSFN, the indication information of the uplink feedback process is added to the uplink feedback signaling; After receiving the uplink feedback signaling, the UE can uniquely determine the uplink feedback signaling according to the MBMS service identification information and the indication information in the uplink feedback signaling, and can ensure the UE even if the uplink feedback signaling in the same feedback process is sent multiple times. Feedback only once.

In order to make the objects, technical solutions and advantages of the present invention more clear, the following embodiments are The invention will be described in further detail with reference to the accompanying drawings.

Before the network side sends a service, it needs to determine the number of UEs that are interested in the service in the service coverage area. The network side prepares to send an uplink feedback signaling to the service coverage area to understand whether the service area is in the service area. The UEs that are interested in the service, and the number of UEs that are interested in the network; the uplink feedback signaling configured on the network side includes: service identifier, feedback content, feedback indication, etc., wherein the feedback indication is set to 001, In the present invention, the indication information of the uplink feedback may be separately set for different MBMS services; for example, the same value range of the indication information may be set for different MBMS services, for example, [0000, The identification range of 1110], the network side's uplink feedback for each MBMS service, and the value of [0000, 1110] is sequentially given and the indication information of the uplink feedback is given, so that the indication information of the MBMS service identification information and the uplink feedback can be unique. The uplink feedback signaling is determined. Certainly, different indication information of the uplink feedback may be set for different MBMS services, and the uplink signaling may be determined by using the indication information itself; but the implementation manner is difficult, and a large amount of indication information for identifying the uplink feedback needs to be set, and Configure the correspondence between the indication information and the MBMS service. The feedback content in the uplink feedback signaling is set according to the needs of the network side, such as the number of users interested in statistics, and may also be feedback of other information about the UE, such as current operating state information of the UE. Other information is not excluded from the uplink feedback signaling.

The network side sends the uplink feedback signaling described above. Specifically, the system message can be broadcast to all UEs in the area to be sent. The manner of sending the uplink feedback signaling is exactly the same as that of the existing uplink feedback signaling. The implementation details are not described here.

As shown in FIG. 1 , UE1 receives the uplink feedback signaling in the first MCCH repetition period, and UE1 is interested in the service; that is, UE1 subscribes to the MBMS service, and UE1 sends The uplink feedback information is sent to the network side. Specifically, the uplink feedback information may include an MBMS service identifier, or a user identifier, or an uplink feedback indication information (001). After receiving the uplink feedback information, the network side can identify specific feedback. The content is fine. With the aforementioned pair of MBMS For example, when the network side receives the received uplink feedback information, the network side can determine that the current feedback information is for the foregoing uplink, according to the identification information such as the MBMS service identifier and the indication information. Feedback from the feedback signaling, UE1 that performs uplink feedback is the user who is interested in the MBMS service. Specifically, after receiving the uplink feedback signaling, UE1 saves the information of the uplink feedback signaling.

In the subsequent MCCH period, the UE1 receives the same uplink feedback signaling again, and the uplink feedback signaling includes the MBMS service identifier, the feedback content, the indication information, and the like, which are the same as the uplink feedback signaling received in the previous MCCH period. The UE1 compares the currently received uplink feedback signaling with the previously received uplink feedback signaling, and determines that the content in the uplink feedback signaling is completely the same, and determines that the currently received uplink feedback signaling and the previously received uplink feedback signaling are For the signaling of the same feedback process, the currently received uplink feedback signaling is discarded. Here, the uplink feedback signaling is determined to be the same as the MBMS service identifier in the uplink feedback signaling, and the indication information is also the same. UE1 will no longer perform uplink feedback for the currently received uplink feedback signaling.

The network side then sets up a feedback process 2 for the same service, and the network side needs to reconfigure the uplink feedback signaling. The reconfigured uplink feedback signaling includes the MBMS service identifier and the feedback content Cause (the statistics on the MBMS service sense) Information such as the number of users of interest), feedback indication (002, identifying the feedback signaling).

The UE1 receives the reconfigured uplink feedback signaling in the new feedback process, compares the currently received uplink feedback signaling with the previously received uplink feedback signaling, and determines the MBMS in the currently received uplink feedback signaling. The service identifier and the feedback content are exactly the same as the previously received uplink feedback signaling, but the feedback indication information becomes 002, but unlike the previously received feedback indication information 001, UE1 can determine that the currently received uplink feedback signaling is a network. For an uplink feedback process initiated by the same MBMS service, UE1 will again obtain the channel that needs feedback according to the requirements of the feedback content, and feed back the obtained uplink feedback information to the network side. In the present invention, after receiving the uplink feedback signaling, the UE compares the MBMS service identifier and the indication information in the uplink feedback signaling with the corresponding information in the previously received uplink feedback signaling, respectively, to determine the foregoing information. When they are all the same, it means that the currently received uplink feedback information is the same as the previously received uplink feedback signaling, otherwise it is different. Specifically, when the UE receives the uplink feedback information, even if the uplink feedback signaling has been uplinked, the uplink feedback signaling is buffered in the set time period, so as to be updated with the newly received uplink feedback. Signaling is compared. Generally, the buffer period of the uplink feedback signaling may be set to one MCCH period, and of course, it may be set longer. In this way, for different MBMS services, the same uplink feedback indication information may be set to be shared, that is, the value segment of the foregoing indication information is set, and for a certain MBMS service, the value in the value segment of the cyclic indication information is used to identify different feedbacks. The uplink feedback signaling of the process can be.

The setting of the feedback process depends on the operator's MBMS service setting requirements. The operator can continuously configure multiple feedback processes for the same feedback content to count the user information in multiple consecutive processes. It is also possible to configure the feedback process discontinuously.

The UE determines that the currently received uplink feedback signaling is different from the previously received uplink feedback signaling, and when the uplink feedback information is obtained and the uplink feedback is performed, the indication information of the uplink feedback signaling for the feedback information is also fed back to the network. side. If the indication information of the currently received uplink feedback signaling is 002, when the uplink feedback is sent for the uplink feedback signaling, the indication information indicating that the information is 002 is carried. The network side determines, according to the MBMS service identifier in the uplink feedback information and the corresponding indication information, which uplink feedback is performed for which uplink feedback signaling.

2 is a schematic structural diagram of a first embodiment of a system for uplink feedback according to the present invention. As shown in FIG. 2, the system for uplink feedback in this example includes a sending unit 20, configured to send uplink feedback signaling to a UE, where the uplink feedback is An indication indicating the uplink feedback process is added to the signaling.

FIG. 3 is a schematic structural diagram of a second embodiment of the system for uplink feedback according to the present invention. As shown in FIG. 3, the system for uplink feedback in this example further includes a receiving unit 21, a determining unit 22, and a discarding unit 23. And a feedback unit 24; wherein

The receiving unit 21 is configured to receive uplink feedback signaling sent by the sending unit 20;

The determining unit 22 is configured to determine whether the uplink feedback signaling received by the receiving unit 21 is the same as the received uplink feedback signaling, and triggers the discarding unit 23 when the same; otherwise, the feedback unit 24 is triggered; and the discarding unit 23 is configured to discard Current uplink feedback signaling;

The feedback unit 24 is configured to perform uplink feedback according to the received uplink feedback signaling.

The above indication information uniquely identifies an uplink feedback process for the same MBMS service. The foregoing uplink feedback signaling further includes MBMS service identification information and feedback content information. The determining unit 22 further further indicates the currently received uplink feedback signaling indication information, the MBMS service identification information, the received uplink feedback signaling indication information, and the MBMS. When the service identification information is respectively compared, the same is determined that the currently received uplink feedback signaling is the same as the received uplink feedback signaling, otherwise it is different.

The received uplink feedback signaling is the uplink feedback signaling received in the set time period before the current uplink feedback signaling is received.

The feedback unit 24 further obtains feedback information according to the indication of the feedback content in the uplink feedback signaling, and feeds the feedback information to the network side, and the indication information of the uplink feedback signaling corresponding to the feedback information is And feedback to the network side.

It should be understood by those skilled in the art that the system for uplink feedback shown in FIG. 2 and FIG. 3 is designed to implement the foregoing method for uplink feedback, and the implementation functions of the foregoing processing units may refer to the foregoing method for uplink feedback. Understand the relevant description. The functions of the various processing units in the figure can be implemented by a program running on a processor, or by a specific logic circuit.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

Claim

A method for uplink feedback, the method comprising:

The uplink feedback signaling sent by the network side to the user equipment UE is further provided with indication information that identifies the uplink feedback process.

2. The method according to claim 1, wherein the method further comprises:

The method according to claim 2, wherein the indication information uniquely identifies an uplink feedback process for the same multimedia broadcast multicast MBMS service.

The method according to claim 3, wherein the uplink feedback signaling further includes MBMS service identification information and feedback content information;

The UE compares the currently received indication information of the uplink feedback signaling and the MBMS service identification information with the received indication information of the uplink feedback signaling and the MBMS service identification information, and determines the currently received uplink feedback signaling when they are all the same. Same as the received uplink feedback signaling, otherwise it is not the same.

The method according to claim 4, wherein the received uplink feedback signaling is uplink feedback signaling received by the UE within a set period before receiving the current uplink feedback signaling.

The method according to claim 5, wherein the method further includes: the UE acquiring feedback information according to the indication of the feedback content in the uplink feedback signaling, and feeding back the feedback information to the network side And the indication information of the uplink feedback signaling corresponding to the feedback information is fed back to the network side.

7. A system for uplink feedback, wherein the system comprises:

The system according to claim 7, wherein the system further comprises a receiving unit, a determining unit, a discarding unit and a feedback unit;

a discarding unit, configured to discard current uplink feedback signaling;

The system according to claim 8, wherein the indication information uniquely identifies an uplink feedback process in the MBSFN.

The system according to claim 9, wherein the uplink feedback signaling further includes MBMS service identification information and feedback content information;

The determining unit further compares the currently received indication information of the uplink feedback signaling and the MBMS service identification information with the received indication information of the uplink feedback signaling and the MBMS service identification information, and determines the currently received uplink feedback when they are all the same. The signaling is the same as the received uplink feedback signaling, otherwise it is not the same.

The system according to claim 10, wherein the received uplink feedback signaling is an uplink feedback signal received within a set period before the current uplink feedback signaling is received.

The system according to claim 11, wherein the feedback unit further obtains feedback information according to the indication of the feedback content in the uplink feedback signaling, and feeds the feedback information to the network side, and The indication information of the uplink feedback signaling corresponding to the feedback information is fed back to the network side.