CN102271408B

CN102271408B - Method for allocating uplink resources in LTE (Long Term Evolution) system

Info

Publication number: CN102271408B
Application number: CN201010195763.8A
Authority: CN
Inventors: 宿淑艳; 姜春霞
Original assignee: Potevio Institute of Technology Co Ltd
Current assignee: Potevio Institute of Technology Co Ltd
Priority date: 2010-06-01
Filing date: 2010-06-01
Publication date: 2014-02-26
Anticipated expiration: 2030-06-01
Also published as: CN102271408A

Abstract

The invention discloses a method for allocating uplink resources in an LTE (Long Term Evolution) system. The method comprises the following step of: setting a resource allocating variable B(i, j) for each logic channel of each UE (User Equipment) and initializing the B(i, j) to 0 by an eNodeB. The method further comprises the following steps of: A, gradually increasing the B(i, j) according to PBR(i, j) in each transmission time interval (TTI); B, determining the priority of all the UE and allocating the uplink resources for each logic channel of each UE according to a current B(i, j) in accordance with a descending sequence of the priority of all the UE when current uplink resources are allocated; and C, updating the current B(i, j) according to the currently-allocated uplink resources, ending the allocating of the current uplink resources and returning to the step A and entering next time allocating of the current uplink resources. With the adoption of the method disclosed by the invention, the performance of the system can be improved.

Description

A kind of uplink resource allocating method of LTE system

Technical field

The present invention relates to field of mobile communication, particularly a kind of uplink resource allocating method of LTE system.

Background technology

Along with the development of wireless communication technique, 3-G (Generation Three mobile communication system) standardization partnership projects (3GPP) has proposed Long Term Evolution (LTE) system.In LTE system, ascending resource is to distribute to corresponding subscriber equipment (UE) by evolved base station (eNodeB), common distribution method is: eNodeB requires to distribute for UE the ascending resource of some according to the service quality of business (QoS), to meet the qos requirement of the business of UE, so just completed the process that ascending resource distributes, the uplink resource multiplexing that follow-up UE distributes eNodeB is given each logic channel.

For instance, eNodeB can be that UE quantity allotted is 10 ascending resource according to qos requirement, the resource multiplex that follow-up UE is 10 by quantity is given each logic channel, the logic channel total amount that might as well suppose current UE is 2, these two logic channels are designated as respectively the first logic channel and the second logic channel, UE is according to the Data Transmission Feature of the first logic channel and the second logic channel, the uplink resource multiplexing that can be 4 by quantity is given the first logic channel, and the uplink resource multiplexing that is 6 by quantity is given the second logic channel.

Visible, in the uplink resource allocating method providing in prior art, eNodeB is just that UE distributes ascending resource according to qos requirement, but how UE depends on UE for the transfer of data of each logic channel completely by ascending resource, so just there is a drawback: because eNodeB carries out ascending resource, divide timing, just for UE distributes the spendable ascending resource total amount of UE, do not take into full account the Data Transmission Feature of each logic channel of UE, therefore, eNodeB is that the ascending resource that UE distributes not necessarily can meet the Data Transmission Feature of each logic channel of UE, reduced the performance of system.

Summary of the invention

In view of this, the invention provides a kind of uplink resource allocating method of LTE system, can improve systematic function.

For solving the problems of the technologies described above, technical scheme of the present invention is achieved in that

A uplink resource allocating method for LTE system, the method comprises: each logic channel that evolved base station eNodeB is each user equipment (UE) arranges resource and distributes variable B _{i, j}, and by B _{i, j}be initialized as 0, wherein, B _{i, j}the resource that is j the logic channel of i UE is distributed variable, and the method also comprises:

A, B _{i, j}according to PBR _{i, j}at each Transmission Time Interval TTI, increase progressively, wherein, PBR _{i, j}preferential bit rate PBR for j the logic channel of i pre-configured UE;

B, at ascending resource last time, divide timing, determine the priority of UE, successively according to the priority of UE from height to low order, according to current B _{i, j}each logical channel assignment ascending resource for each UE;

C, according to the ascending resource of current sub-distribution to current B _{i, j}upgrade, finish last time ascending resource and distribute, and return to steps A, enter ascending resource next time and distribute.

B described in steps A _{i, j}according to PBR _{i, j}the method increasing progressively comprises: at each TTI, B _{i, j}accumulate once PBR _{i, j}* TTI, the B of the result after cumulative after upgrading _{i, j}, wherein, the result after cumulative is more than or equal to PBR _{i, j}* BSD _{i, j}time, the result after cumulative is set to PBR _{i, j}* BSD _{i, j}, the B of the result after cumulative after upgrading _{i, j}, BSD _{i, j}leaky bucket size duration BSD for j the logic channel of i pre-configured UE.

In step B, the method for each logical channel assignment ascending resource described in i UE is comprised: according to B _{i, j}being greater than 0 priority of logical channels is each logical channel assignment ascending resource from height to low order.

Step B further comprises: if the B of all logic channels of i UE _{i, j}all be less than or equal to 0, finish the last time ascending resource of i UE to distribute, and priority is proceeded to ascending resource distribution lower than other UE of i UE.

Method to j the logical channel assignment ascending resource of i UE comprises:

By B _{i, j}as I transmitted bit, count T _{i, jmin}, according to I transmitted bit, count T _{i, jmin}determine the Resource Block quantity M that j the logic channel of i UE need distribute _{i, j}, wherein, described definite method is: if according to M _{i, j}and the modulation coding mode MCS of current selection calculate can count T by transmitted bit _{i, j}be more than or equal to T _{i, jmin}, stop j the logical channel assignment ascending resource to i UE; Otherwise, adjust M _{i, j}, then according to M _{i, j}and selected MCS calculates T _{i, j}, then judge T _{i, j}whether be more than or equal to T _{i, jmin}, until T _{i, j}be more than or equal to T _{i, jmin}the resource of this logic channel is distributed end.

Described in step C to current B _{i, j}the method of upgrading comprises: according to the Resource Block quantity M distributing _{i, j}and the MCS of current selection calculating reality can be counted S by transmitted bit _{i, j}; Calculate B _{i, j}with S _{i, j}poor, the B using result after upgrading _{i, j}.

After step B and before step C, the method further comprises: judge whether surplus resources in addition, if without surplus resources, perform step C; If also have surplus resources, distribute surplus resources, and then execution step C.

According to technical scheme provided by the invention, the resource that each logic channel that eNodeB is each UE arranges is distributed variable B _{i, j}at each Transmission Time Interval TTI, increase progressively, at ascending resource last time, divide timing, successively according to the priority of UE from height to low order, according to current B _{i, j}each logical channel assignment ascending resource for each UE, visible, in uplink resource allocating method provided by the present invention, when eNodeB is UE distribution ascending resource, taken into full account the Data Transmission Feature of each logic channel of UE, like this, eNodeB is the Data Transmission Feature that the ascending resource of UE distribution can meet each logic channel of UE, has improved the performance of system

Accompanying drawing explanation

Fig. 1 is the flow chart of the uplink resource allocating method of a kind of LTE system provided by the present invention.

Embodiment

For making object of the present invention, technical scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, scheme of the present invention is described in further detail.

Fig. 1 is the flow chart of the uplink resource allocating method of a kind of LTE system provided by the present invention.As shown in Figure 1, the method comprises the following steps:

Step 101, each logic channel that eNodeB is each UE arranges resource and distributes variable B _{i, j}, and by B _{i, j}be initialized as 0, wherein, B _{i, j}the resource that is j the logic channel of i UE is distributed variable, represents transmitted bit number.

It should be noted that, after system starts, step 101 is only carried out once, when the follow-up resource next time that enters, divides timing, and step 101 no longer repeats.

Step 102, B _{i, j}according to PBR _{i, j}at each Transmission Time Interval (TTI), increase progressively, wherein, PBR _{i, j}preferential bit rate (PBR) for j the logic channel of i pre-configured UE.

Specifically, B _{i, j}according to PBR _{i, j}the method increasing progressively is: at each TTI, B _{i, j}accumulate once PBR _{i, j}* TTI, the B of the result after cumulative after upgrading _{i, j}, wherein, the result after cumulative is more than or equal to PBR _{i, j}* BSD _{i, j}time, the result after cumulative is set to PBR _{i, j}* BSD _{i, j}, the B of the result after cumulative after upgrading _{i, j}, BSD _{i, j}for the leaky bucket size duration (BSD) of j the logic channel of i pre-configured UE, PBR _{i, j}* the transmitted bit number that TTI is each TTI, PBR _{i, j}* BSD _{i, j}for transmitted bit is counted maximum.

Step 103, divides timing at ascending resource last time, determines the priority of UE, successively according to the priority of UE from height to low order, according to current B _{i, j}for each logical channel assignment ascending resource of each UE, wherein, the method for determining UE priority can adopt the method for prior art.

Specifically, be that i UE distributes the method for ascending resource to be: according to B _{i, j}being greater than 0 priority of logical channels is each logical channel assignment ascending resource from height to low order, and wherein, the priority of logic channel is pre-configured.

When j logical channel assignment ascending resource to i UE, as follows: by B _{i, j}as I transmitted bit, count T _{i, jmin}, according to I transmitted bit, count T _{i, jmin}determine the Resource Block quantity M that j the logic channel of i UE need distribute _{i, j}, described definite method is: according to the current Resource Block quantity M having distributed _{i, j}and selected modulation coding mode (MCS) calculates and can count T by transmitted bit _{i, j}if be more than or equal to T _{i, jmin}, the resource of this logic channel is distributed end; Otherwise, adjust M _{i, j}, then according to M _{i, j}and selected MCS calculates T _{i, j}, then judge T _{i, j}whether be more than or equal to T _{i, jmin}, until T _{i, j}be more than or equal to T _{i, jmin}, the resource of this logic channel is distributed end.

Wherein, T _{i, j}the content that the method for calculating is prior art no longer describes in detail herein.

In addition, step 103 is also had to 3 needs explanations:

The first, when distributing ascending resource, the Resource Block of take distributes as unit, the Resource Block quantity M distributing according to j the logic channel of i UE _{i, j}the T calculating in conjunction with MCS _{i, j}not necessarily just equal B _{i, j}as long as the principle of distribution makes T _{i, j}be more than or equal to T _{i, jmin}, i.e. T _{i, j}be more than or equal to B _{i, j}, can meet the Data Transmission Feature of j the logic channel of i UE.

The MCS that the second, UE carries out transmitting uplink data has determined the Resource Block quantity M distributing _{i, j}data transmission capabilities, therefore, divide timing carrying out resource, should singly not consider to need the Resource Block quantity M distributing _{i, j}, also should consider in conjunction with MCS.

The 3rd, if the B of all logic channels of i UE _{i, j}all be less than or equal to 0, finish the resource of i UE to distribute, and priority is proceeded to resource distribution lower than other UE of i UE.

Step 104, according to the ascending resource of current sub-distribution to current B _{i, j}upgrade, finish last time ascending resource and distribute, and return to step 102, enter resource next time and distribute.

Specifically, to B _{i, j}the method of upgrading is: according to the Resource Block quantity M distributing _{i, j}and the MCS of current selection calculating reality can be counted S by transmitted bit _{i, j}; Calculate B _{i, j}with S _{i, j}poor, the B using result after upgrading _{i, j}.

In addition, step 104 be it should be noted that, before step 104, also can further comprise the steps: to judge whether to also have surplus resources, if without surplus resources, directly perform step 104, if also have surplus resources, distribute surplus resources, and then perform step 104, wherein, the distribution method of surplus resources is more flexible, can, with reference to method of the prior art, for example, can no longer be limited to B _{i, j}whether be greater than 0, according to UE priority from height to low order, for each UE, according to priority of logical channels order, all logic channels are carried out to resource distribution again, also can be for the logic channel that guarantees bit rate (GBR) the business place resource of additionally reallocating, make the logic channel at GBR business place reach GBR, for the logic channel at non-GBR business place, no longer additional allocation resource.

Wherein, when without surplus resources, the S calculating in step 104 _{i, j}equal the T in step 103 _{i, j}, when also having surplus resources, distribute after surplus resources, for the channel of additional allocation surplus resources, the S that calculates in step 104 _{i, j}be greater than the T in step 103 _{i, j}.

So far, this flow process finishes.

To sum up, in the present invention, the resource that each logic channel that eNodeB is each UE arranges is distributed variable B _{i, j}at each Transmission Time Interval TTI, increase progressively, at ascending resource last time, divide timing, successively according to the priority of UE from height to low order, according to current B _{i, j}for each logical channel assignment ascending resource of each UE, visible, in uplink resource allocating method provided by the present invention, eNodeB be UE while distributing ascending resource with B _{i, j}for foundation, and at each TTI, B _{i, j}accumulate once PBR _{i, j}* TTI, guaranteed the PBR of each logic channel, thereby taken into full account the Data Transmission Feature of each logic channel of UE, like this, eNodeB is the Data Transmission Feature that the ascending resource of UE distribution can meet each logic channel of UE, can improve the performance of system.

Claims

1. a uplink resource allocating method for LTE system, is characterized in that, the method comprises: each logic channel that evolved base station eNodeB is each user equipment (UE) arranges resource and distributes variable B _i,j, and by B _i,jbe initialized as 0, wherein, B _i,jthe resource that is j the logic channel of i UE is distributed variable, and the method also comprises:

A, B _i,jaccording to PBR _i,jat each Transmission Time Interval TTI, increase progressively, wherein, PBR _i,jpreferential bit rate PBR for j the logic channel of i pre-configured UE;

B, at ascending resource last time, divide timing, determine the priority of UE, successively according to the priority of UE from height to low order, according to current B _i,jeach logical channel assignment ascending resource for each UE;

C, according to the ascending resource of current sub-distribution to current B _i,jupgrade, finish last time ascending resource and distribute, and return to steps A, enter ascending resource next time and distribute;

Wherein, B described in steps A _i,jaccording to PBR _i,jthe method increasing progressively comprises: at each TTI, B _i,jaccumulate once PBR _i,j* TTI, the B of the result after cumulative after upgrading _i,j, wherein, the result after cumulative is more than or equal to PBR _i,j* BSD _i,jtime, the result after cumulative is set to PBR _i,j* BSD _i,j, the B of the result after cumulative after upgrading _i,j, BSD _i,jleaky bucket size duration BSD for j the logic channel of i pre-configured UE;

Described in step C to current B _i,jthe method of upgrading comprises: according to the Resource Block quantity M distributing _i,jand the MCS of current selection calculating reality can be counted S by transmitted bit _i,j; Calculate B _i,jwith S _i,jpoor, the B using result after upgrading _i,j.

2. method according to claim 1, is characterized in that, in step B, the method for each logical channel assignment ascending resource described in i UE is comprised: according to B _i,jbeing greater than 0 priority of logical channels is each logical channel assignment ascending resource from height to low order.

3. method according to claim 2, is characterized in that, step B further comprises: if the B of all logic channels of i UE _i,jall be less than or equal to 0, finish the last time ascending resource of i UE to distribute, and priority is proceeded to ascending resource distribution lower than other UE of i UE.

4. method according to claim 3, is characterized in that, the method for j the logical channel assignment ascending resource of i UE is comprised:

By B _i,jas I transmitted bit, count T _{i, jmin}, according to I transmitted bit, count T _{i, jmin}determine the Resource Block quantity M that j the logic channel of i UE need distribute _i,j, wherein, described definite method is: if according to M _i,jand the modulation coding mode MCS of current selection calculate can count T by transmitted bit _i,jbe more than or equal to T _{i, jmin}, stop j the logical channel assignment ascending resource to i UE; Otherwise, adjust M _i,j, then according to M _i,jand selected MCS calculates T _i,j, then judge T _i,jwhether be more than or equal to T _{i, jmin}, until T _i,jbe more than or equal to T _{i, jmin}the resource of this logic channel is distributed end.

5. method according to claim 1, is characterized in that, after step B and before step C, the method further comprises: judge whether surplus resources in addition, if without surplus resources, perform step C; If also have surplus resources, distribute surplus resources, and then execution step C.