CN1917694A - Method for selecting random access channel by user terminal in radio mobile communication system - Google Patents
Method for selecting random access channel by user terminal in radio mobile communication system Download PDFInfo
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- CN1917694A CN1917694A CNA2005100906197A CN200510090619A CN1917694A CN 1917694 A CN1917694 A CN 1917694A CN A2005100906197 A CNA2005100906197 A CN A2005100906197A CN 200510090619 A CN200510090619 A CN 200510090619A CN 1917694 A CN1917694 A CN 1917694A
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Abstract
In the invention, the radio communication system where the user end locates at is a multi carrier system, in which each cell is allocated to at least one carrier, and the uplink synchronizing channel associated with the random access channel exists on the carrier of at least one said cell; measuring the signals quality of uplink synchronizing channel on each carrier, and according to the channel quality measuring result, setting the quality level of the uplink synchronizing channel on each carrier; then, according to the quality level of the uplink synchronizing channel on each carrier, setting the dynamical keeping level of its associated random access channel, and informing the dynamical keeping level of its associated random access channel to said user end; finally, according to the dynamical keeping level of said random access channel, user end makes selection from available random access channels.
Description
Technical field
The present invention relates to a kind ofly guarantee that user terminal in the mobile radio system inserts the method for possibility at random, more specifically, relates to the method for user terminal selecting Random Access Channel in a kind of mobile radio system.
Background technology
By means of this notion of multi-carrier-wave wireless mobile communication system, a sub-district in the described system just can hold more user in identical coverage, and can obtain average throughput burst rate simultaneously.To save the common channel resources of each carrier wave like this, thereby more effectively improve the ability of mobile radio system large-scale network-estabilishing.
For example, in Time Division-Synchronous Code Division Multiple Access (TD-SCDMA) multi-carrier-wave wireless mobile communication system, a sub-district is configured to a plurality of carrier waves, and uplink synchronous channel can exist on a plurality of carrier waves of cell configuration described.Owing to may exist a uplink synchronous channel on the described carrier wave (or to be called uplink pilot time slot: the possibility that is seriously undermined in a certain period uplink pilot time slot), and described uplink synchronous channel is associated with Random Access Channel (RACH:Random Access Channel) and will be used in random access procedure by the user terminal in the sub-district, thereby the at random access (Random Access) of user terminal on impaired carrier wave attempted and will be failed probably.From whole service time, this has increased negatively, and (call setup) set up in conversation or transfer of data (data transmission) postpones.Therefore, in this case, described system should provide reliable protective measure, successfully carries out so that guarantee the access at random of all user terminals in the sub-district.About the interrelational form of uplink synchronous channel and Random Access Channel and the detailed description of random access procedure see also 3GPP standard document TS 25.331.
In addition, described system also should have sensitiveness to the mis-behave that inserts at random.Thereby this system wishes to have user terminal disengaging repetition and the invalid access attempts at random that a kind of autonomous mechanism promptly guides those " useless " simultaneously.But so far also less than the good method of finding to address this problem.
Summary of the invention
The object of the invention is, in case the disturbed obstruction of uplink synchronous channel (incoming interferenceblock) on certain described carrier wave inserts at random with regard to the uplink synchronous channel that provides a kind of measure rapidly and flexibly to come informing user terminal to reselect on the described preferably carrier wave of other quality.
Above-mentioned purpose of the present invention is realized by following technical scheme: the method for user terminal selecting Random Access Channel in the mobile radio system, wherein, the mobile radio system at described user terminal place is a multicarrier system, a sub-district in the described system is configured at least one carrier wave, and the uplink synchronous channel related with described Random Access Channel is described for existing on the carrier wave of cell configuration at least one; At first the channel quality of the uplink synchronous channel on described each carrier wave is measured, and according to the uplink synchronous channel quality scale on described each carrier wave of described channel quality measurements setting; Then, set the dynamic maintenance rank of related with it Random Access Channel, and notify the dynamic maintenance rank of described Random Access Channel to described user terminal according to the uplink synchronous channel quality scale on described each carrier wave; At last, described user terminal is selected its available Random Access Channel according to the dynamic maintenance rank of described Random Access Channel.
According to one aspect of the invention, when the channel quality of the uplink synchronous channel on described each carrier wave was measured, described channel quality was by the interference level decision of the uplink synchronous channel on described each carrier wave in the duration.
According to one aspect of the invention, when the uplink synchronous channel quality scale on described each carrier wave is set, determine uplink synchronous channel wanted to interfering signal ratio on described each carrier wave according to the interference level measured value and the received power of the uplink synchronous channel of sub-district Node B expectation of the uplink synchronous channel on described each carrier wave in the transmission time, and described uplink synchronous channel wanted to interfering signal ratio and predetermined SIR threshold value set compared, so that the uplink synchronous channel quality scale on described each carrier wave is set.
According to one aspect of the invention, described SIR threshold value set is by operation management center or the configuration of sub-district Node B.
According to one aspect of the invention, described Random Access Channel also at least one described for cell configuration carrier wave on exist, and the carrier wave at a described Random Access Channel place is identical with the carrier wave at uplink synchronous channel associated therewith place.
According to one aspect of the invention, described Random Access Channel is mapped at least one Physical Random Access Channel on its place carrier wave, and when the described Physical Random Access Channel that is mapped to is two or more, each described Physical Random Access Channel that is mapped to is set dynamic maintenance rank respectively.
According to one aspect of the invention, the uplink synchronous channel quality scale on described each carrier wave is set and the dynamic maintenance grade setting of described Random Access Channel periodically carries out.
According to one aspect of the invention, if current quality scale that is set of described uplink synchronous channel with its before the quality scale that once is set mutually specific damping the k level, the dynamic maintenance rank of then setting related with it whole Physical Random Access Channels increases k level or 2k level, if the dynamic maintenance rank after described Physical Random Access Channel increases is greater than 8, setting described dynamic maintenance rank is 8; If comparing with the quality scale that once is set before it, current quality scale that is set of described uplink synchronous channel increased the k level, and when the access load on related with it Physical Random Access Channel is not high, the dynamic maintenance rank of then setting described Physical Random Access Channel reduces k level or 2k level, if the dynamic maintenance rank after described Physical Random Access Channel reduces is less than 1, setting described dynamic maintenance rank is 1.
According to one aspect of the invention, the dynamic maintenance rank of the whole Physical Random Access Channels on a carrier wave is equal to or greater than N
Threshold valueThe time, then when described user terminal is selected Random Access Channel, forbid that directly it selects described N on described carrier wave
Threshold valueBy operation management center or the configuration of sub-district Node B.
According to one aspect of the invention, when the dynamic maintenance rank of any one described Physical Random Access Channel changes, the sub-district Node B starts business information piece SIB7 and/or SIB7bis renewal process, and described user terminal obtains above-mentioned updated information based on the out-of-date mechanism of timer simultaneously.
Description of drawings
Below in conjunction with accompanying drawing, describe specific embodiments of the invention in detail.Wherein:
Fig. 1 is that the uplink synchronous channel quality scale is set and Random Access Channel dynamically keeps the schematic diagram of grade setting in multi-carrier TD-SCDMA system.
Embodiment
According to the present invention, in the multi-carrier-wave wireless mobile communication system, described system adjusts the selectable Random Access Channel of user terminal by the dynamic maintenance rank (dynamic persistence level) of adjusting the Random Access Channel on the different carrier and can allow the carrier subset (carrier subset) at the Random Access Channel place of user terminal selecting, thereby shorten the trial time of user terminal in random access procedure, improve the probability of success of random access procedure.
In implementation process of the present invention, if a sub-district in the multi-carrier TD-SCDMA mobile radio system is configured at least one carrier wave, and the uplink synchronous channel related with Random Access Channel is described for existing on the carrier wave of cell configuration at least one.When the user terminal selecting Random Access Channel, as shown in Figure 1, at first, the channel quality of the uplink synchronous channel on described each carrier wave is measured, and according to the uplink synchronous channel quality scale on described each carrier wave of described channel quality measurements setting; Then, set the dynamic maintenance rank of related with it Random Access Channel, and notify the dynamic maintenance rank of described Random Access Channel to described user terminal according to the uplink synchronous channel quality scale on described each carrier wave; At last, described user terminal is selected its available Random Access Channel according to the dynamic maintenance rank of described Random Access Channel.
The quality scale of described uplink synchronous channel can be set at a plurality of ranks, for example is set at level Four, is respectively good, common, bad, blocks, and uses from 0 to 3 digitized representation respectively.For the purpose of simplified system, also can use the less grade setting of number.
In multi-carrier TD-SCDMA system, Node B can periodically be carried out the interference level measurement of described uplink synchronous channel in the duration on each described carrier wave, and calculates signal-to-jamming ratio (SIR) numerical value of each described uplink synchronous channel in conjunction with the received power value of known desired uplink synchronous channel.Further, Node B can be gathered for example { SIR with the numerical value and the predetermined quality SIR threshold value that calculate
Well, SIR
Common, SIR
BlockCompare, to obtain the quality scale of each described uplink synchronous channel.
If at the SIR of the described uplink synchronous channel that calculates greater than SIR
Well, then the quality scale of described uplink synchronous channel is " well "; If the SIR of the described uplink synchronous channel that calculates is less than SIR
WellSimultaneously greater than SIR
Common, then the quality scale of described uplink synchronous channel is " common "; If the SIR of the described uplink synchronous channel that calculates is less than SIR
CommonSimultaneously greater than SIR
Block, then the quality scale of described uplink synchronous channel is " bad "; If the SIR of the described uplink synchronous channel that calculates is less than SIR
Block, then the quality scale of described uplink synchronous channel is " obstruction ".
Can determine described SIR threshold value set { SIR by operation management center (OMC) configuration or by Node B oneself
Well, SIR
Common, SIR
Block.
In described system, Random Access Channel also can be described for existing on the carrier wave of cell configuration at least one, and the carrier wave at a described Random Access Channel place is identical with the carrier wave at uplink synchronous channel associated therewith place.Described Random Access Channel can be mapped at least one Physical Random Access Channel (PRACH) on its place carrier wave, and when the described Physical Random Access Channel that is mapped to is two or more, each described Physical Random Access Channel that is mapped to is set dynamic maintenance rank respectively.
Set according to the uplink synchronous channel quality scale on described each carrier wave, Node B can use following step that the dynamic maintenance rank of described Physical Random Access Channel is set:
(1) if current quality scale that is set of described uplink synchronous channel with its before the quality scale that once is set mutually specific damping the k level, the dynamic maintenance rank of then setting related with it whole Physical Random Access Channels increase the k level (when the number of described quality scale more for a long time) or the 2k level (when the number of described quality scale more after a little while), if the dynamic maintenance rank after described Physical Random Access Channel increases is greater than 8, setting described dynamic maintenance rank is 8;
(2) if comparing with the quality scale that once is set before it, current quality scale that is set of described uplink synchronous channel increased the k level, and when the access load on related with it Physical Random Access Channel is not high, the dynamic maintenance rank of then setting described Physical Random Access Channel reduce the k level (when the number of described quality scale more for a long time) or the 2k level (when the number of described quality scale more after a little while), if the dynamic maintenance rank after described Physical Random Access Channel reduces is less than 1, setting described dynamic maintenance rank is 1.
When the dynamic maintenance level of any one described Physical Random Access Channel changes, Node B should start-up system service message piece SIB7 and/or SIB7bis notify described Physical Random Access Channel dynamically to keep other renewal of level to described user terminal.Simultaneously, described user terminal receives the setting of described dynamic continuance level based on the mechanism that timer is out-of-date from described SIB7 and/or SIB7bis.Definition to the out-of-date mechanism of described timer sees also 3GPP standard document 3GPPTS 25.331.
Described be in each carrier wave of cell configuration, if the dynamic maintenance rank of the whole Physical Random Access Channels on carrier wave is equal to or greater than N
Threshold valueThe time, then when described user terminal is selected Random Access Channel, forbid that directly it selects on described carrier wave.
Therefore, described user terminal can further be divided into the selection of Random Access Channel and carry out the step of preliminary election and the step of on the carrier wave after the preliminary election Random Access Channel being selected to described for the carrier wave of cell configuration.If I is for carrying out remaining number of carriers in the described pre-selection step described on the carrier wave of cell configuration, (1) defines 1 interval according to the following equation:
Wherein
n
mThe minimum rank that dynamically keeps of representing Physical Random Access Channel on m the described carrier wave, m=1 ..., I.Then, produce one [0,1) equally distributed random digit rand, and (2) carry out the carrier wave preliminary election in described residue carrier wave according to the following equation:
The index of preliminary election carrier wave=
At last, described user terminal is finished the step of according to the dynamic maintenance rank of Random Access Channel Random Access Channel being selected on the carrier wave after the preliminary election, this step can be identical with the selection step of Random Access Channel of definition among 3GPP 1.28Mcps TDD (time division duplex) the single carrier mobile radio system standard document 3GPP TS 25.331.
The present invention can be described multicarrier system and provides based on the Physical Random Access Channel on each carrier wave and dynamically keep rank and insert taking all factors into consideration of loading condition, comes rapidly and flexibly informing user terminal to reselect the method that the uplink synchronous channel on the described preferably carrier wave of other quality inserts at random.
The application of the invention has farthest been avoided user terminal because the Physical Random Access Channel on the selection low quality carrier wave repeats access attempts at random and spend long time, thereby shortens the trial time of user terminal in random access procedure.And, the present invention also can exist on the carrier wave serious disturb or situation than overdamp under, rapidly informing user terminal reselect other quality preferably the physical accidental channel on the carrier wave insert at random, thereby increased the success rate that inserts at random.
The specific embodiment that the invention is not restricted to provide.It will be understood by those skilled in the art that under the prerequisite that does not break away from flesh and blood of the present invention and purport, can change and change, and these variations and change also fall within protection scope of the present invention the present invention.
Claims (10)
1. the method for user terminal selecting Random Access Channel in the mobile radio system, wherein, the mobile radio system at described user terminal place is a multicarrier system, a sub-district in the described system is configured at least one carrier wave, and the uplink synchronous channel related with described Random Access Channel is described for existing on the carrier wave of cell configuration at least one; It is characterized in that: at first the channel quality of the uplink synchronous channel on described each carrier wave is measured, and according to the uplink synchronous channel quality scale on described each carrier wave of described channel quality measurements setting; Then, set the dynamic maintenance rank of related with it Random Access Channel, and notify the dynamic maintenance rank of described Random Access Channel to described user terminal according to the uplink synchronous channel quality scale on described each carrier wave; At last, described user terminal is selected its available Random Access Channel according to the dynamic maintenance rank of described Random Access Channel.
2. method according to claim 1 is characterized in that when the channel quality of the uplink synchronous channel on described each carrier wave is measured, and described channel quality is by the interference level decision of the uplink synchronous channel on described each carrier wave in the duration.
3. method according to claim 2, it is characterized in that when the uplink synchronous channel quality scale on described each carrier wave is set, determine uplink synchronous channel wanted to interfering signal ratio on described each carrier wave according to the interference level measured value and the received power of the uplink synchronous channel of sub-district Node B expectation of the uplink synchronous channel on described each carrier wave in the transmission time, and described uplink synchronous channel wanted to interfering signal ratio and predetermined SIR threshold value set compared, so that the uplink synchronous channel quality scale on described each carrier wave is set.
4. method according to claim 3 is characterized in that: described SIR threshold value set is by operation management center or the configuration of sub-district Node B.
5. method according to claim 1, it is characterized in that described Random Access Channel also at least one described for cell configuration carrier wave on exist, and the carrier wave at a described Random Access Channel place is identical with the carrier wave at uplink synchronous channel associated therewith place.
6. method according to claim 5, described Random Access Channel is mapped at least one Physical Random Access Channel on its place carrier wave, and when the described Physical Random Access Channel that is mapped to is two or more, each described Physical Random Access Channel that is mapped to is set dynamic maintenance rank respectively.
7. method according to claim 6 is characterized in that: the uplink synchronous channel quality scale on described each carrier wave is set and the dynamic maintenance grade setting of described Random Access Channel periodically carries out.
8. method according to claim 7, it is characterized in that: if current quality scale that is set of described uplink synchronous channel with its before the quality scale that once is set mutually specific damping the k level, the dynamic maintenance rank of then setting related with it whole Physical Random Access Channels increases k level or 2k level, if the dynamic maintenance rank after described Physical Random Access Channel increases is greater than 8, setting described dynamic maintenance rank is 8; If comparing with the quality scale that once is set before it, current quality scale that is set of described uplink synchronous channel increased the k level, and when the access load on related with it Physical Random Access Channel is not high, the dynamic maintenance rank of then setting described Physical Random Access Channel reduces k level or 2k level, if the dynamic maintenance rank after described Physical Random Access Channel reduces is less than 1, setting described dynamic maintenance rank is 1.
9. according to each described method among the claim 6-8, it is characterized in that: when the dynamic maintenance rank of the whole Physical Random Access Channels on the carrier wave is equal to or greater than the N threshold value, then when described user terminal is selected Random Access Channel, forbid that directly it selects on described carrier wave.
10. according to each described method among the claim 6-9, it is characterized in that: when the dynamic maintenance rank of any one described Physical Random Access Channel changes, the sub-district Node B starts business information piece SIB7 and/or SIB7bis renewal process, and described user terminal obtains above-mentioned updated information based on the out-of-date mechanism of timer simultaneously.
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| CN100441045C (en) | 2008-12-03 |
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