CN103249160A - Resource allocation method under CoMP transfer mode in LTE-A system - Google Patents

Abstract

The invention relates to a resource allocation method under a CoMP (Coordinated Multiple Points) transfer mode in an LTE-A (Long Term Evolution-Advanced) system. The resource allocation method comprises the following steps: finding out a point corresponding to the maximal RSRP (Reference Signal Received Power) value to be taken as a servicing point through measuring RSRP of point users in all point base station in the system, taking points corresponding to RSRP which has the difference (smaller than a threshold) with the maximal RSRP as CoMP in a CoMP measuring set, so as to determine the coordination set of each user, and then adaptively selecting the RB transfer mode according to the performance of each RB under the CoMP transfer mode and the single point mode. Aiming at the CoMP transmission system, a resource scheduling algorithm is provided, and does not limit the number of the coordinated points serviced by each user, and is suitable for a selection method for coordination sets of points with overlapping coordinated sets, and is beneficial to improvement of handling capacity.

Description

Resource allocation methods in a kind of LTE-A system under the CoMP

Technical field

The present invention relates to communication technical field, particularly, relate to the resource allocation methods under the CoMP in a kind of LTE-A system.

Background technology

Along with increasing of broadband wireless data business demand, requirement reaches higher spectrum efficiency, introduced multi-cell cooperating CoMP (Coordinated Multiple Points) technology in LTE-A (the Long Term Evolution-Advanced) system, eliminate presence of intercell interference, wherein the resource distribution is one of key issue in the CoMP technology, how to determine that each user is served by several residential quarters, whether dispatch CoMP on each Resource Block with needing the cooperative information between the residential quarter to determine per family, only rely on the Resource Scheduler of this cell base station to be difficult to realize.

CoMP dispatching algorithm commonly used is associating Proportional Fair scheme (Joint Proportional Fairness Scheduling, be called for short JPF), this scheme is edge customer and central user by dividing the user, determine CoMP user's set, weigh each Resource Block then in the quality of CoMP transmission mode and single cell transmission pattern, determine the transmission mode of this RB, the limitation of this method is only to be applicable to the cooperation cell of 3 sectors, and the cooperation collection is nonoverlapping residential quarter.

Therefore present multipoint cooperative scene has been introduced the less radio-frequency extension unit, and (Remote Radio Header, RRH), making more residential quarter cooperate becomes possibility, is necessary to study a kind of resource allocation methods of not limited and cooperation cell number.

Summary of the invention

The present invention passes through the base station of all residential quarters in the measuring system at Reference Signal Received Power (the Reference signal Received power of community user, be called for short RSRP), find out maximum RSRP numerical value corresponding district as Serving cell, and in the CoMP measuring assembly, with this RSRP numerical value differ threshold value with interior RSRP corresponding district as the CoMP cooperation cell, determine each user's cooperation set with this, then according to each RB under the CoMP transmission mode and single cell pattern under performance, the transmission mode of adaptive this RB of selection.

In order to achieve the above object, the present invention proposes the resource scheduling algorithm under the CoMP in a kind of LTE-A system, being applicable to that the cooperation collection is overlapping, and the unfixed situation of cooperation collection.Resource allocation methods in the LTE-A system that the present invention proposes under the CoMP comprises:

Step 1: at each terminal, measure all residential quarters at the received power (Reference Signal Received Power is called for short RSRP) of reference signal, wherein RSRP _jIt is the Reference Signal Received Power of j residential quarter;

Step 2: find out maximum RSRP value RSRP _Max, determine to satisfy RSRP _Max-RSRP _j＜RSRP _ThresholdCooperation cell, residential quarter j is joined in the cooperation set of this terminal, if the number of cooperation cell is 1, this user is single community user, if the number of cooperation cell greater than 1, this user is CoMP user;

Step 3: all RB in the system are carried out resource distribute, initialization i=1, wherein i is RB counting sign;

Step 4: the initialization set omega is the set of all residential quarters in the whole system;

Step 5: the priority of all the CoMP users among the pair set Ω sorts from high to low, is designated as set U;

Step 6: the highest user Uc of weights in the pair set U, determine its cooperation collection, if this user's CoMP priority, summation greater than single User Priority in the corresponding cooperation cell, just this RB is made as and adopts the CoMP transmission, otherwise this RB is made as single cell transmission, and used cooperation set is removed from set omega;

Step 7: if set omega is not empty, returns step 5 and distribute to the resource of step 6, otherwise execution in step 8;

Step 8: if i=N _RB, N wherein _RBBe the RB sum, algorithm finishes, and resource has assigned, otherwise upgrades i, and i=i+1 returns step 4 and distributes to the resource of step 7.

As a kind of preferred version, step 5 comprises:

Step 5a: calculate the priority valve that each RB goes up all users according to the equitable proportion algorithm;

Step 5b: structure CoMP user limit priority weight table;

As a kind of preferred version, step 6 comprises:

Step 6a: screening cooperation collection is that the CoMP user of subclass Ω gathers U;

Step 6b: find out the user that weights are the highest among the U and determine its cooperation collection;

Step 6c: search weight table.

As a kind of preferred version, the equitable proportion algorithm calculates each RB and goes up the weights of all single community users under single cell transmission pattern and CoMP user CoMP transmission mode

$P_{k,i}\left(t\right)=\frac{R_{k,i}\left(t\right)}{\stackrel{\‾}{R_{k,i}\left(t\right)}},$

R wherein _{K, i}(t) be that i RB goes up the maximum transmission rate that user UEk can reach at scheduling moment t,

Be average transmission rate, its more new formula be:

$\stackrel{\‾}{R_{k,i}\left(t\right)}=(1-\frac{1}{t_c})\stackrel{\‾}{R_{k,i}(t-1)}+\frac{1}{t_c}{R}_{k,i}(t-1)$

The present invention passes through the base station of all residential quarters in the measuring system at Reference Signal Received Power (the Reference Signal Received Power of community user, be called for short RSRP), find out maximum RSRP numerical value corresponding district as Serving cell, and in the CoMP measuring assembly, with this RSRP numerical value differ threshold value with interior RSRP corresponding district as the CoMP cooperation cell, determine each user's cooperation set with this, then according to each RB under the CoMP transmission mode and single cell pattern under performance, the transmission mode of adaptive this RB of selection.The present invention can satisfy the overlapping and unfixed requirement of cooperation cell number of cooperation cell.

Description of drawings

Fig. 1 is the resource allocation methods schematic diagram under the CoMP in the LTE-A of the present invention system.

Embodiment

Below embodiments of the invention are elaborated, present embodiment is being to implement under the prerequisite with the technical solution of the present invention, provided detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.At different network systems, the present invention can have different embodiment.

As shown in Figure 1, the resource allocation methods in the LTE-A system that the present invention proposes under the CoMP comprises:

Step 1: at each terminal, measure all residential quarters at the received power (Reference Signal Received Power is called for short RSRP) of reference signal, wherein RSRP _jIt is the Reference Signal Received Power of j residential quarter;

Step 2: find out maximum RSRP value RSRP _Max, determine to satisfy RSRP _Max-RSRP _j＜RSRP _ThresholdCooperation cell, residential quarter j is joined in the cooperation set of this terminal, if the number of cooperation cell is 1, this user is single community user, if the number of cooperation cell greater than 1, this user is CoMP user;

Step 3: all RB in the system are carried out resource distribute, initialization i=1, wherein i is RB counting sign;

Step 4: the initialization set omega is the set of all residential quarters in the whole system;

Step 5: the priority of all the CoMP users among the pair set Ω sorts from high to low, is designated as set U;

Step 6: the highest user Uc of weights in the pair set U, determine its cooperation collection, if this user's CoMP priority, summation greater than single User Priority in the corresponding cooperation cell, just this RB is made as and adopts the CoMP transmission, otherwise this RB is made as single cell transmission, and used cooperation set is removed from set omega;

Step 7: if set omega is not empty, returns step 5 and distribute to the resource of step 6, otherwise execution in step 8;

Step 8: if i=N _RB, N wherein _RBBe the RB sum, algorithm finishes, and resource has assigned, otherwise upgrades i, and i=i+1 returns step 4 and distributes to the resource of step 7.

As a kind of preferred version, step 5 comprises:

Step 5a: calculate the priority valve that each RB goes up all users according to the equitable proportion algorithm;

Step 5b: structure CoMP user limit priority weight table.

As a kind of preferred version, step 6 comprises:

Step 6a: screening cooperation collection is that the CoMP user of Ω subclass gathers U;

Step 6b: find out the user that weights are the highest among the U and determine its cooperation collection;

Step 6c: search weight table.

In one embodiment of the invention, the concrete steps of resource distribution are:

Step 1: the RSRP numerical value of user k on the j of residential quarter is designated as RSRP _{K, j}

Step 2: the RSRP of largest cell is designated as RSRP _Max, find out RSRP _Max-RSRP _j＜RSRP _ThresholdThe residential quarter, add in the cooperation set, if the number of cooperation set is 1, this user is single community user, if cooperation cell greater than 1, this user is many community users;

Step 3: all RB in the system are carried out resource distribute, initialization i=1, wherein i is RB counting sign;

Step 4: the initialization set omega is the set of all residential quarters in the whole system;

Step 5: each RB is done resource distribute, the priority of the many community users among the Ω is sorted;

Step 6: the user UE that finds out greatest priority _m, its corresponding cooperation cell number is N, the residential quarter is { cell ₁, cell ₂..., cell _N, find out cell respectively ₁To cell _NSingle community user UE of middle limit priority ₁, UE ₂... UE _NIf, N * P _{M, i}＞P _{1, i}+ P _{2, i}...+P _{N, i}, user UE _mUse resource RB _iCarry out the CoMP transmission, otherwise user UE ₁, UE ₂... UE _NUse resource RBi to carry out single cell transmission;

Step 7: upgrade set omega, Ω=Ω-{ cell ₁..., cell _N, if Ω is not empty, the above step 5 that then circulates is carried out resource to 6 and is distributed;

Step 8: if Ω is empty, then next RB is carried out above step 4 to the resource of step 7 and distribute, assigned up to all RB resources.

In sum, be preferred embodiment of the present invention more than, be not to limit protection scope of the present invention.Under the situation that does not deviate from spirit of the present invention and essence thereof, the person of ordinary skill in the field works as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of claim of the present invention.

Claims (4)

1. the resource allocation methods under the CoMP in the LTE-A system is characterized in that, comprising:

Step 1: at each terminal, measure all residential quarters at the received power (Reference Signal Received Power is called for short RSRP) of reference signal, wherein RSRP _jIt is the Reference Signal Received Power of j residential quarter;

Step 2: find out maximum RSRP value RSRP _Max, determine to satisfy RSRP _Max-RSRP _j＜RSRP _ThresholdCooperation cell, residential quarter j is joined in the cooperation set of this terminal, if the number of cooperation cell is 1, this user is single community user, if the number of cooperation cell greater than 1, this user is CoMP user;

Step 3: all RB in the system are carried out resource distribute, initialization i=1, wherein i is RB counting sign;

Step 4: the initialization set omega is the set of all residential quarters in the whole system;

Step 5: the priority of all the CoMP users among the pair set Ω sorts from high to low, is designated as set U;

Step 6: the highest user Uc of weights in the pair set U, determine its cooperation collection, if this user's CoMP priority, summation greater than single User Priority in the corresponding cooperation cell, just this RB is made as and adopts the CoMP transmission, otherwise this RB is made as single cell transmission, and used cooperation set is removed from set omega;

Step 7: if set omega is not empty, returns step 5 and distribute to the resource of step 6;

Step 8: if i=N _RB, N wherein _RBBe the RB sum, algorithm finishes, and resource has assigned, otherwise upgrades i, and i=i+1 returns step 4 and distributes to the resource of step 6.

2. the resource allocation methods under the CoMP in the LTE-A according to claim 1 system is characterized in that step 5 comprises:

Step 5a: calculate the priority valve that each RB goes up all users according to the equitable proportion algorithm;

Step 5b: structure CoMP user limit priority weight table.

3. the resource allocation methods under the CoMP in the LTE-A according to claim 1 system is characterized in that step 6 comprises:

Step 6a: screening cooperation collection is that the CoMP user of Ω subclass gathers U;

Step 6b: find out the user that weights are the highest among the U and determine its cooperation collection;

Step 6c: search weight table.

4. the resource allocation methods under the CoMP in the LTE-A according to claim 1 system is characterized in that the equitable proportion algorithm calculates each RB and goes up the weights of all single community users under single cell transmission pattern and CoMP user CoMP transmission mode

$P_{k,i}\left(t\right)=\frac{R_{k,i}\left(t\right)}{\stackrel{\‾}{R_{k,i}\left(t\right)}}$

R wherein _{K, i}(t) be that i RB goes up the maximum transmission rate that user UEk can reach at scheduling moment t, Be average transmission rate, its more new formula be:

$\stackrel{\‾}{R_{k,i}\left(t\right)}=(1-\frac{1}{t_c})\stackrel{\‾}{R_{k,i}(t-1)}+\frac{1}{t_c}{R}_{k,i}(t-1)$

T wherein _cBe window update time.

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