CN102271408A

CN102271408A - Method for allocating uplink resources in LTE (Long Term Evolution) system

Info

Publication number: CN102271408A
Application number: CN2010101957638A
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: 2011-12-07
Anticipated expiration: 2030-06-01
Also published as: CN102271408B

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

The uplink resource allocating method of a kind of LTE system

Technical field

The present invention relates to field of mobile communication, the uplink resource allocating method of particularly a kind 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 the LTE system, ascending resource is to distribute to corresponding user 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 (QoS) of business, qos requirement with the business that satisfies UE, so just finished the process that ascending resource distributes, follow-up UE gives each logic channel with the uplink resource multiplexing that eNodeB distributes.

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

As seen, in the uplink resource allocating method that prior art provided, eNodeB is that UE distributes ascending resource according to qos requirement just, but UE depends on UE fully with the transfer of data how ascending resource is used for each logic channel, so just there is a drawback: because eNodeB carries out ascending resource and divides timing, just distribute the spendable ascending resource total amount of UE for UE, do not take into full account the Data Transmission Feature of each logic channel of UE, therefore, eNodeB is the Data Transmission Feature that the ascending resource of UE distribution not necessarily can satisfy each logic channel of UE, has reduced the performance of system.

Summary of the invention

In view of this, the invention provides the uplink resource allocating method of a kind 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

The uplink resource allocating method of a kind of LTE system, this method comprises: evolved base station eNodeB is provided with resource allocation variable B for each logic channel of each user equipment (UE) _{I, j}, and with B _{I, j}Be initialized as 0, wherein, B _{I, j}Be the resource allocation variable of j the logic channel of i UE, this method also comprises:

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

B, divide timing, determine the priority of UE at ascending resource last time, 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, end last time ascending resource distributes, and returns steps A, and entering next time, ascending resource distributes.

B described in the steps A _{I, j}According to PBR _{I, j}The method that increases progressively comprises: at each TTI, B _{I, j}PBR adds up one time _{I, j}* TTI, with the result after adding up as the B after upgrading _{I, j}, wherein, the result after adding up is more than or equal to PBR _{I, j}* BSD _{I, j}The time, the result after adding up is changed to PBR _{I, j}* BSD _{I, j}, with the result after adding up as the B after upgrading _{I, j}, BSD _{I, j}Leakage bucket size duration BSD for j the logic channel of i pre-configured UE.

Method to i described each the logical channel assignment ascending resource of UE among the step B comprises: according to B _{I, j}Priority of logical channels greater than 0 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 smaller or equal to 0, then finish the last time ascending resource of i UE is distributed, and other UE that priority is lower than i UE are proceeded the ascending resource distribution.

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

With B _{I, j}Count T as I transmitted bit _{I, jmin}, count T according to I transmitted bit _{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 but the transmitted bit that the modulation coding mode MCS of current selection is calculated is counted T _{I, j}More than or equal to T _{I, jmin}, then stop j logical channel assignment ascending resource to i UE; Otherwise, then adjust M _{I, j}, again according to M _{I, j}And selected MCS calculates T _{I, j}, judge T again _{I, j}Whether more than or equal to T _{I, jmin}, until T _{I, j}More than or equal to T _{I, jmin}Then the resource allocation of this logic channel finishes.

Described in the step C to current B _{I, j}Carrying out method for updating comprises: according to the Resource Block quantity M that distributes _{I, j}And but the MCS of current selection calculating reality transmitted bit is counted S _{I, j}Calculate B _{I, j}With S _{I, j}Poor, with the result as the B after upgrading _{I, j}

After step B and before the step C, this method further comprises: judge whether surplus resources in addition, if no surplus resources, then execution in step C; If also have surplus resources, then distribute surplus resources, and then execution in step C.

According to technical scheme provided by the invention, eNodeB is the resource allocation variable B that each logic channel of each UE is provided with _{I, j}Increase progressively at each Transmission Time Interval TTI, divide timing at ascending resource last time, 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, as seen, 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 satisfy each logic channel of UE, has improved the performance of system

Description of drawings

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

Embodiment

For making purpose of the present invention, technical scheme and advantage clearer, below with reference 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 provided by the present invention system.As shown in Figure 1, this method may further comprise the steps:

Step 101, eNodeB is provided with resource allocation variable B for each logic channel of each UE _{I, j}, and with B _{I, j}Be initialized as 0, wherein, B _{I, j}Be the resource allocation variable of j the logic channel of i UE, expression transmitted bit number.

Need to prove that step 101 is only carried out once after the system start-up, when entering resource allocation next time, step 101 no longer repeats when follow-up.

Step 102, B _{I, j}According to PBR _{I, j}(TTI) increases progressively at each Transmission Time Interval, wherein, and 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 that increases progressively is: at each TTI, B _{I, j}PBR adds up one time _{I, j}* TTI, with the result after adding up as the B after upgrading _{I, j}, wherein, the result after adding up is more than or equal to PBR _{I, j}* BSD _{I, j}The time, the result after adding up is changed to PBR _{I, j}* BSD _{I, j}, with the result after adding up as the B after upgrading _{I, j}, BSD _{I, j}Be the leakage bucket size duration (BSD) of j the logic channel of i pre-configured UE, PBR _{I, j}* TTI is the transmitted bit number of each TTI, PBR _{I, j}* BSD _{I, j}For transmitted bit is counted maximum.

Step 103 is divided 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}Be 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}Priority of logical channels greater than 0 is each logical channel assignment ascending resource from height to low order, and wherein, the priority of logic channel is pre-configured.

When to j logical channel assignment ascending resource of i UE, as follows: with B _{I, j}Count T as I transmitted bit _{I, jmin}, count T according to I transmitted bit _{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 that has distributed _{I, j}And selected modulation coding mode (MCS) but calculate transmitted bit and count T _{I, j}If, more than or equal to T _{I, jmin}, then the resource allocation of this logic channel finishes; Otherwise, then adjust M _{I, j}, again according to M _{I, j}And selected MCS calculates T _{I, j}, judge T again _{I, j}Whether more than or equal to T _{I, jmin}, until T _{I, j}More than or equal to T _{I, jmin}, then the resource allocation of this logic channel finishes.

Wherein, T _{I, j}Calculation Method is the content of prior art, no longer describes in detail herein.

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

The first, when distributing ascending resource, be that unit distributes with the Resource Block, according to j the Resource Block quantity M that logic channel distributed of i UE _{I, j}In conjunction with the T that MCS calculated _{I, j}Not necessarily equal B just _{I, j}As long as the principle of distribution makes T _{I, j}More than or equal to T _{I, jmin}, i.e. T _{I, j}More than or equal to B _{I, j}, then can satisfy the Data Transmission Feature of j the logic channel of i UE.

The second, the MCS that UE carries out transmitting uplink data has determined the Resource Block quantity M that distributed _{I, j}Data transmission capabilities, therefore, when carrying out resource allocation, should be singly need to consider the Resource Block quantity M that distributes _{I, j}, also should consider in conjunction with MCS.

The 3rd, if the B of all logic channels of i UE _{I, j}All, then finish resource allocation, and other UE that priority is lower than i UE are proceeded resource allocation i UE smaller or equal to 0.

Step 104, according to the ascending resource of current sub-distribution to current B _{I, j}Upgrade, end last time ascending resource distributes, and returns step 102, enters resource allocation next time.

Specifically, to B _{I, j}Method for updating is: according to the Resource Block quantity M that distributes _{I, j}And but the MCS of current selection calculating reality transmitted bit is counted S _{I, j}Calculate B _{I, j}With S _{I, j}Poor, with the result as the B after upgrading _{I, j}

In addition, step 104 be need to prove, before step 104, also can further comprise the steps: to judge whether to also have surplus resources, if no surplus resources, then direct execution in step 104, if also have surplus resources, then distribute surplus resources, and then execution in step 104, wherein, the distribution method of surplus resources is more flexible, can for example, can no longer be subject to B with reference to method of the prior art _{I, j}Whether greater than 0, according to UE priority from height to low order, for each UE, according to the priority of logical channels order all logic channels are carried out resource allocation again, also can be for the logic channel that guarantees the professional place of bit rate (GBR) resource of additionally reallocating, make the logic channel at the professional place of GBR reach GBR, for the logic channel at the professional place of non-GBR, no longer additional allocation resource.

Wherein, when no surplus resources, the S that is calculated in the step 104 then _{I, j}Equal the T in the step 103 _{I, j}, after also have surplus resources, distributing surplus resources, for the channel of additional allocation surplus resources, the S that calculates in the step 104 then _{I, j}Greater than the T in the step 103 _{I, j}

So far, this flow process finishes.

To sum up, in the present invention, eNodeB is the resource allocation variable B that each logic channel of each UE is provided with _{I, j}Increase progressively at each Transmission Time Interval TTI, divide timing at ascending resource last time, successively according to the priority of UE from height to low order, according to current B _{I, j}Be each logical channel assignment ascending resource of each UE, as seen, in uplink resource allocating method provided by the present invention, eNodeB be UE when distributing ascending resource with B _{I, j}Be foundation, and at each TTI, B _{I, j}PBR adds up one time _{I, j}* TTI, then 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 satisfy each logic channel of UE, can improve the performance of system.

Claims

1. the uplink resource allocating method of a LTE system is characterized in that, this method comprises: evolved base station eNodeB is provided with resource allocation variable B for each logic channel of each user equipment (UE) _{I, j}, and with B _{I, j}Be initialized as 0, wherein, B _{I, j}Be the resource allocation variable of j the logic channel of i UE, this method also comprises:

2. method according to claim 1 is characterized in that, B described in the steps A _{I, j}According to PBR _{I, j}The method that increases progressively comprises: at each TTI, B _{I, j}PBR adds up one time _{I, j}* TTI, with the result after adding up as the B after upgrading _{I, j}, wherein, the result after adding up is more than or equal to PBR _{I, j}* BSD _{I, j}The time, the result after adding up is changed to PBR _{I, j}* BSD _{I, j}, with the result after adding up as the B after upgrading _{I, j}, BSD _{I, j}Leakage bucket size duration BSD for j the logic channel of i pre-configured UE.

3. method according to claim 1 is characterized in that the method to i described each the logical channel assignment ascending resource of UE among the step B comprises: according to B _{I, j}Priority of logical channels greater than 0 is each logical channel assignment ascending resource from height to low order.

4. method according to claim 3 is characterized in that step B further comprises: if the B of all logic channels of i UE _{I, j}All smaller or equal to 0, then finish the last time ascending resource of i UE is distributed, and other UE that priority is lower than i UE are proceeded the ascending resource distribution.

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

6. method according to claim 1 is characterized in that, described in the step C to current B _{I, j}Carrying out method for updating comprises: according to the Resource Block quantity M that distributes _{I, j}And but the MCS of current selection calculating reality transmitted bit is counted S _{I, j}Calculate B _{I, j}With S _{I, j}Poor, with the result as the B after upgrading _{I, j}

7. method according to claim 1 is characterized in that, after step B and before the step C, this method further comprises: judge whether surplus resources in addition, if no surplus resources, then execution in step C; If also have surplus resources, then distribute surplus resources, and then execution in step C.