CN102264129B

CN102264129B - Method and device for distributing resources

Info

Publication number: CN102264129B
Application number: CN201010188547.0A
Authority: CN
Inventors: 朱剑驰; 佘小明; 陈岚
Original assignee: NTT Docomo Inc
Current assignee: NTT Docomo Inc
Priority date: 2010-05-31
Filing date: 2010-05-31
Publication date: 2015-06-10
Anticipated expiration: 2030-05-31
Also published as: CN102264129A; JP5769500B2; JP2011254467A

Abstract

The invention provides a method for distributing resources. The method comprises the following steps: A, selecting one frequency domain resource unit in all of frequency domain resource units to be distributed; B, scheduling on the selected frequency domain resource unit, selecting a scheduling result in the scheduling result according to a corresponding relationship between recorded user equipment (UE) and a demodulating frequency reference signal (DM-RS) port, and ensuring that the DM-RS ports of all of the frequency domain resource units which are distributed to the same UE are the same; C, distributing a corresponding DM-RS port to the UE which has not been distributed with the corresponding DM-RS port according to the selected scheduling result, recording the corresponding relationship between the newly established UE and the DM-RS port, and then returning to step A until all of the frequency domain resource units are distributed. The invention further provides a device for distributing resources. The method and the device can be used for realizing scheduling of an LTE-A (long term evolution-Advanced) system.

Description

Resource allocation method and device

Technical Field

The present invention relates to mobile communication technologies, and in particular, to a method and an apparatus for resource allocation in an improved long term evolution (LTE-Advanced, LTE-a) system.

Background

The cellular Mobile phone brings great convenience to the Communication of people, and the second generation Global System for Mobile Communication (GSM) adopts a digital Communication technology, so that the Communication quality of Mobile Communication is further improved. As an important organization in The field of mobile communication, The Third Generation partnership Project (3 GPP) has greatly advanced The standardization of The Third Generation mobile communication technology (3G), and established a series of communication system specifications including Wideband Code Division Multiple Access (WCDMA), High Speed Downlink Packet Access (HSDPA), High Speed Uplink Packet Access (HSUPA), and The like.

In order to meet the challenge of broadband access technology and meet the increasing demand of new services, 3GPP started standardization work of 3G Long Term Evolution (LTE) technology in the end of 2004, and hoped to further improve spectrum efficiency, improve performance of cell edge users, reduce system delay, provide higher rate access service for high-speed mobile users, and the like. The improved LTE (LTE-Advanced, LTE-a) technology is based on the LTE technology, and increases the spectrum bandwidth several times, increases the data rate several times, and provides services with higher rate and better performance for more mobile users.

The LTE-a system supports multi-user multiple input multiple output (MU-MIMO) technology, that is, the LTE-a system can simultaneously schedule multiple Users (UEs) on the same spectrum Resource, that is, in the LTE-a system, multiple UEs can share the spectrum Resource, such as Resource Block (RB). Therefore, how to complete resource allocation and implement user scheduling is one of the key problems that the LTE-a system needs to solve.

Disclosure of Invention

The invention provides a resource allocation method and a resource allocation device, which are used for realizing MU-MIMO scheduling of an LTE-A system.

The resource allocation method according to an embodiment of the present invention includes:

a, selecting a frequency domain resource unit from all frequency domain resource units to be distributed;

b, scheduling on the selected frequency domain resource unit, and selecting a scheduling result from the scheduling results according to the recorded corresponding relation between the user equipment UE and the demodulation pilot signal DM-RS port, so as to ensure that the DM-RS ports of all the frequency domain resource units allocated to the same UE are the same;

and C, distributing the corresponding DM-RS port for the UE which is not distributed with the corresponding DM-RS port according to the selected scheduling result, recording the newly established corresponding relation between the UE and the DM-RS port, and then returning to A until all frequency domain resource units are distributed.

Further comprising, prior to performing A: a0, selecting a Rank value, and setting the ranks of all frequency domain resource units to be allocated equal to the value;

further comprising, after performing C: d, recording a resource allocation result corresponding to the Rank value, then returning to A0 until a resource allocation result is obtained for all possible Rank values, and then executing E;

e, comparing the resource allocation results corresponding to different Rank values, and taking the allocation result with the best selective performance as a final resource allocation result; wherein the scheduling on the selected frequency domain resource unit comprises: and carrying out SU-MIMO or/and MU-MIMO scheduling according to the selected Rank value, wherein the sum of the ranks of the scheduled UEs is equal to the selected Rank value.

The above B includes:

a1, carrying out SU-MIMO or/and MU-MIMO scheduling on the selected frequency domain resource unit and obtaining a scheduling result;

a2, judging whether DM-RS port conflict exists between all scheduled UEs in the scheduling result according to the recorded corresponding relation between the UE and the DM-RS port,

if the DM-RS port conflict exists, the scheduling result is considered to be incapable of ensuring that DM-RS ports of all frequency domain resource units allocated to the same UE are the same, the scheduling result is discarded, and the scheduling result is returned to A1;

and if the DM-RS port conflict does not exist, the scheduling result is considered to be capable of ensuring that DM-RS ports of all frequency domain resource units allocated to the same UE are the same, and the scheduling result is taken as the selected scheduling result.

And the corresponding relation between the UE and the DM-RS port recorded before the resource allocation is null.

The resource allocation method according to another embodiment of the present invention includes:

a, selecting a frequency domain resource unit from all resource block frequency domain resource units to be distributed;

b, scheduling on the selected frequency domain resource unit, and selecting a scheduling result from the scheduling results according to the recorded corresponding relationship between the user equipment UE and the demodulation pilot frequency signal DM-RS port and the corresponding relationship between the UE and the corresponding Rank, so as to ensure that DM-RS ports of all frequency domain resource units allocated to the same UE are the same, and simultaneously ensure that the ranks of all frequency domain resource units allocated to the same UE are the same;

and C, according to the selected scheduling result, allocating a corresponding DM-RS port for the UE which is not allocated with the corresponding DM-RS port, recording the newly established corresponding relation between the UE and the DM-RS port, determining the corresponding Rank for the UE which is not allocated with the corresponding Rank, recording the newly established corresponding relation between the UE and the Rank, and then returning to A until all frequency domain resource units are allocated.

The above B includes:

b1, carrying out SU-MIMO or/and MU-MIMO scheduling on the selected frequency domain resource unit and obtaining a scheduling result;

b2, judging whether DM-RS port conflict exists between all scheduled UEs in the scheduling result according to the recorded corresponding relation between the UE and the DM-RS port,

if the DM-RS port conflict exists, the scheduling result is considered to be incapable of ensuring that DM-RS ports of all frequency domain resource units allocated to the same UE are the same, the scheduling result is discarded, and the scheduling result is returned to B1;

if the DM-RS port conflict does not exist, the scheduling result is considered to ensure that DM-RS ports of all frequency domain resource units allocated to the same UE are the same, and B3 is executed;

b3, judging whether the Rank of all frequency domain resource units allocated to the same UE is the same according to the scheduling result and the recorded correspondence between the UE and the corresponding Rank,

if so, taking the scheduling result as the selected scheduling result;

otherwise, the scheduling result is discarded and B1 is returned.

Allocating the corresponding DM-RS port for the UE which is not allocated with the corresponding DM-RS port comprises the following steps: and allocating the corresponding DM-RS ports to the UE which is not allocated with the corresponding DM-RS ports in an ascending, descending or random mode, so as to ensure that the DM-RS ports corresponding to different UEs which are scheduled on the selected frequency domain resource unit are different.

Recording the newly established corresponding relationship between the UE and the DM-RS port comprises the following steps: and respectively configuring a DM-RS port register for recording a DM-RS port corresponding to the UE for each UE, and recording the newly established corresponding relation between the UE and the DM-RS port.

Determining the Rank corresponding to the UE without the corresponding Rank comprises the following steps: and determining corresponding Rank for the UE without corresponding Rank according to the number of the UE scheduled on the selected frequency domain resource unit.

Recording the newly established corresponding relationship between the UE and the Rank comprises the following steps: and respectively configuring a Rank register for recording the Rank corresponding to each UE for each UE, and recording the newly established corresponding relationship between the UE and the Rank.

The recorded corresponding relation between the UE and the DM-RS port before resource allocation is null, and the recorded corresponding relation between the UE and the Rank is null.

Selecting a frequency domain resource unit from all resource block frequency domain resource units to be allocated comprises: selecting a frequency domain resource unit with the highest weighted sum or the highest priority or the highest throughput from all frequency domain resource units to be distributed; or randomly selecting one frequency domain resource unit from all the frequency domain resource units to be allocated.

The scheduling adopts a proportional fair PF scheduling algorithm or a polling RR scheduling algorithm or a maximum carrier-to-interference ratio MCI scheduling algorithm.

An embodiment of the present invention further provides a resource allocation apparatus, including:

the resource selection module is used for selecting one frequency domain resource unit from all resource block frequency domain resource units to be allocated until all the frequency domain resource units are allocated;

the user scheduling module is used for scheduling on the selected frequency domain resource unit, selecting a scheduling result from the scheduling results according to the recorded corresponding relation between the user equipment UE and the demodulation pilot signal DM-RS port, and ensuring that the DM-RS ports of all the frequency domain resource units allocated to the same UE are the same;

and the corresponding relation recording module is used for allocating the corresponding DM-RS port to the UE which is not allocated with the corresponding DM-RS port according to the selected scheduling result and recording the newly established corresponding relation between the UE and the DM-RS port.

The correspondence recording module includes: and a DM-RS port register which is respectively configured for each UE and used for recording the DM-RS port corresponding to the UE.

The correspondence recording module may further include: the Rank register is respectively configured for each UE and used for recording the Rank register corresponding to the UE; the user scheduling module is used for carrying out SU-MIMO or/and MU-MIMO scheduling on the selected frequency domain resource unit, selecting a scheduling result from the scheduling results according to the recorded corresponding relation between the UE and the DM-RS port of the demodulation pilot signal and the corresponding relation between the UE and the Rank, ensuring that the DM-RS ports of all frequency domain resource units allocated to the same UE are the same, and simultaneously ensuring that the Rank of all frequency domain resource units allocated to the same UE is the same.

The resource allocation apparatus further includes:

the Rank setting module is used for selecting a Rank value from all possible values of the Rank until a resource allocation result is obtained for all the possible Rank values; and

and the distribution result selection module is used for comparing the resource distribution results corresponding to different Rank values and selecting the distribution result with the best performance as the final resource distribution result.

The frequency domain resource unit is a resource block RB, a subcarrier or a subband.

The embodiment of the invention provides a resource allocation method and a resource allocation device suitable for an LTE-A system, which can realize the scheduling of the LTE-A system and at least meet the restriction condition that DM-RS ports of all RBs allocated to the same UE are the same.

Drawings

Fig. 1 is a flowchart of a resource allocation method according to embodiment 1 of the present invention;

fig. 2 is a flowchart of a resource allocation method according to embodiment 2 of the present invention;

fig. 3 is a flowchart of a resource allocation method according to embodiment 3 of the present invention;

FIG. 4 is a schematic diagram of an internal structure of a resource allocation apparatus provided in the present invention;

fig. 5 is a schematic diagram of an internal structure of another resource allocation apparatus provided in the present invention.

Detailed Description

In the LTE-a system, in addition to inheriting Common pilot signals (CRS) defined by the LTE release 8(Rel-8) system, two new types of pilot signals (RS) are introduced, including: a channel state information pilot signal (CSI-RS) and a demodulation pilot signal (DM-RS) for a specific UE. The DM-RS is a pilot signal used for demodulation channel estimation. A base station of the LTE-A system can indicate a DM-RS port on an RB allocated by a UE through a DM-RS port indication field in a Physical Downlink Control Channel (PDCCH).

In the LTE-a system, since only one DM-RS port indication field is located on the PDCCH corresponding to each user on the whole frequency band to be scheduled, when performing resource allocation, it is at least required to ensure that DM-RS ports of all RBs allocated to the same UE are the same. However, the existing single-user multiple-input multiple-output (SU-MIMO) and MU-MIMO scheduling methods applied in the LTE system do not consider the above-mentioned limitations when performing resource allocation, and therefore, a new resource allocation method is needed to implement scheduling of the LTE-a system.

It is known that in the LTE-a system, MU-MIMO can be classified into two types, transparent MU-MIMO and non-transparent MU-MIMO, according to their transparency. The transparent MU-MIMO means that the UE can only know information required for demodulating its own data, such as the total number of data streams (Rank), DM-RS ports, etc., on the RB allocated to the UE, and cannot know whether other UEs exist on the same RB. That is, transparent MU-MIMO does not know whether it is SU-MIMO or MU-MIMO by itself. For transparent MU-MIMO, when performing resource allocation, it is only necessary to satisfy the constraint that DM-RS ports of all RBs allocated to the same UE are the same. In addition, the non-transparent MU-MIMO means that the UE can know information of other UEs coexisting on the same RB, for example, Rank of an RB allocated thereto, DM-RS ports of other UEs sharing the RB, and the like, in addition to information required for demodulating its own data. That is, the non-transparent MU-MIMO may know whether it is SU-MIMO or MU-MIMO by itself. Therefore, for non-transparent MU-MIMO, in addition to the constraint that DM-RS ports of all RBs allocated to the same UE are the same (abbreviated as constraint 1), the constraint that Rank of all RBs allocated to the same UE is the same (abbreviated as constraint 2) needs to be satisfied during scheduling.

The following describes in detail resource allocation methods for SU-MIMO, transparent MU-MIMO and non-transparent MU-MIMO, respectively, by specific embodiments.

Example 1

The embodiment provides a resource allocation method for SU-MIMO or/and transparent MU-MIMO, which can realize scheduling of an LTE-A system.

As described above, when allocating RBs for SU-MIMO or/and transparent MU-MIMO, the restriction of the above restriction condition 1 needs to be satisfied, that is, DM-RS ports of all RBs allocated to the same UE need to be the same.

The execution process of the resource allocation method described in this embodiment is shown in fig. 1, and mainly includes the following steps:

step 101: one RB is selected from all RBs to be allocated.

In this step, one RB may be selected from all RBs to be allocated through various methods. For example, the RB with the highest weighted sum, the highest throughput, or the highest priority may be selected from all RBs to be allocated, or one RB may be randomly selected from all RBs to be allocated.

Step 102: and scheduling on the selected RB, and selecting one scheduling result meeting the limiting condition 1 from the scheduling results according to the recorded corresponding relation between the UE and the DM-RS port.

In this step, the scheduling is SU-MIMO scheduling or/and MU-MIMO scheduling. Specifically, the present step includes the following substeps:

a1, carrying out SU-MIMO or/and MU-MIMO scheduling on the selected RB and obtaining a scheduling result;

if the DM-RS port conflict exists, the scheduling result is considered to be incapable of meeting the limitation condition 1, namely the DM-RS ports of all RBs allocated to the same UE are ensured to be the same, the scheduling result is discarded, and A1 is returned;

and if the DM-RS port conflict does not exist, the scheduling result is considered to meet the limitation condition 1, namely the DM-RS ports of all RBs allocated to the same UE are ensured to be the same, and the scheduling result is taken as the selected scheduling result.

In the above process, a variety of user scheduling methods may be employed for SU-MIMO or/and MU-MIMO scheduling on the selected RBs, such as Proportional Fair (PF) scheduling, Round Robin (RR) scheduling, maximum carrier-to-interference ratio (MCI) scheduling, and so on.

For example, in this step, if the recorded correspondence between the UE and the DM-RS Port is as shown in table 1, since both UE1 and UE5 already correspond to Port #0, in order to satisfy the above limitation of limitation condition 1 and avoid DM-RS Port collision between different UEs on the same RB, UE1 and UE5 cannot be scheduled simultaneously when SU-MIMO or/and MU-MIMO scheduling is performed on the selected RB; similarly, since both UE2 and UE3 already correspond to Port #1, both UE2 and UE3 may not be scheduled simultaneously when scheduling SU-MIMO or/and MU-MIMO on the selected RB.

UE	UE1	UE2	UE3	UE4	UE5
						DM-RS port	Port#0	Port#1	Port#1	Port#2	Port#0

TABLE 1

In practical application, the corresponding relationship between the UE and the DM-RS port can be recorded by configuring a DM-RS port register for each UE to record a DM-RS port corresponding to the UE.

It should be noted that the correspondence between the UE and the DM-RS port is established in the process of resource allocation. That is, before resource allocation is performed, all UEs do not have corresponding DM-RS ports, that is, the recorded corresponding relationship between the UEs and the DM-RS ports is null. After one RB is allocated and all UEs scheduled on the RB are allocated with corresponding DM-RS ports, the corresponding relationship between the UEs and the DM-RS ports may be recorded according to the allocation result. In this way, when allocating the next RB, one scheduling result satisfying the constraint condition 1 may be selected from the scheduling results according to the recorded correspondence between the UE and the DM-RS port.

Step 103: and allocating the corresponding DM-RS port for the UE which is not allocated with the corresponding DM-RS port according to the selected scheduling result, recording the newly established corresponding relation between the UE and the DM-RS port, and then returning to the step 101 until all RBs are allocated.

In this step, the corresponding DM-RS ports may be allocated to the UEs that have not been allocated with the corresponding DM-RS ports in an ascending, descending, or random manner, so as to ensure that the DM-RS ports corresponding to different UEs sharing the RB are different.

For example, if the previously recorded correspondence between the UE and the DM-RS port is shown in table 1, the step 102 is executed to obtain the scheduling result of scheduling the UE2, the UE4, and the UE6 on the RB. Wherein the UE2 has been assigned a corresponding DM-RS Port #1, the UE32 has been assigned a corresponding DM-RS Port #2, and the UE6 has not yet assigned a corresponding DM-RS Port. Then in this step the UE6 will be assigned its corresponding DM-RS port. It should be noted that, in order to avoid the DM-RS Port collision between different UEs on the same RB, the DM-RS Port allocated to the UE6 should be different from the DM-RS ports corresponding to other UEs scheduled on the RB, such as Port #1 corresponding to the UE2 and Port #2 corresponding to the UE 4. And, when allocating DM-RS ports for the UE6, it may be allocated in an ascending manner, for example, allocating Port # 0; or in a descending manner, e.g., Port # 3; or Port #0 or Port #3 is allocated in a random manner. And recording the newly established corresponding relation between the UE and the DM-RS ports after the corresponding DM-RS ports are distributed to all the UE which is not distributed with the corresponding DM-RS ports. For example, if the corresponding DM-RS Port allocated to the UE6 is Port #3, the recorded correspondence between the UE and the DM-RS Port will be shown in table 2 after step 103 is completed.

UE

UE1

UE2

UE3

UE4

UE5

UE6

DM-RS port

Port#0

Port#1

Port#2

Port#0

Port#3

TABLE 2

According to the resource allocation method, the corresponding relation between the UE and the DM-RS port is recorded, so that whether DM-RS port conflicts among different UEs exist or not can be judged when SU-MIMO or/and MU-MIMO scheduling is carried out, and the scheduling result meeting the limiting condition 1 is obtained.

Example 2

The embodiment provides a resource allocation method for SU-MIMO or/and non-transparent MU-MIMO, which can realize the scheduling of an LTE-A system.

As described above, when allocating RBs to a non-transparent UE, the restrictions of the restriction condition 1 and the restriction condition 2 need to be satisfied, that is, DM-RS ports of all RBs allocated to the same UE need to be the same and Rank of all RBs allocated to the same UE needs to be the same. In this embodiment, for convenience of description, the Rank of all RBs allocated to the same UE is simply referred to as the Rank corresponding to the UE.

The execution process of the resource allocation method described in this embodiment is shown in fig. 2, and mainly includes the following steps:

step 201: one RB is selected from all RBs to be allocated.

As described in step 101, one RB may be selected from all RBs to be allocated through various methods. For example, the RB with the highest weighted sum, the highest throughput, or the highest priority may be selected from all RBs to be allocated, or one RB may be randomly selected from all RBs to be allocated.

Step 202: and scheduling on the selected RB, and selecting one scheduling result meeting the limiting conditions 1 and 2 from the scheduling results according to the recorded corresponding relationship between the UE and the DM-RS port and the corresponding relationship between the UE and the corresponding Rank.

In this step, the scheduling is SU-MIMO scheduling or/and MU-MIMO scheduling. Specifically, the method specifically comprises the following steps:

b1, carrying out SU-MIMO scheduling or/and MU-MIMO scheduling on the selected RB and obtaining a scheduling result;

b2, judging whether DM-RS port conflicts exist among all scheduled UEs in the scheduling result according to the recorded corresponding relation between the UEs and the DM-RS ports, if the DM-RS port conflicts exist, considering that the scheduling result cannot meet the limitation condition 1, namely that the DM-RS ports of all RBs allocated to the same UE cannot be ensured to be the same, discarding the scheduling result, and returning to B1; if no DM-RS port conflict exists, the scheduling result is considered to meet the limitation condition 1, namely, DM-RS ports of all RBs allocated to the same UE are ensured to be the same, and B3 is executed;

b3, judging whether the ranks of all RBs allocated to the same UE are the same according to the scheduling result and the recorded correspondence between the UE and the corresponding Rank thereof, if so, considering that the scheduling result can meet the limitation condition 2, namely ensuring that the ranks of all RBs allocated to the same UE are the same, and taking the scheduling result as the selected scheduling result; otherwise, the scheduling result is considered not to satisfy the constraint 2, that is, the Rank of all RBs allocated to the same UE cannot be guaranteed to be the same, and the scheduling result is discarded and returned to B1.

In the above process, a plurality of user scheduling methods may be adopted to perform SU-MIMO scheduling or/and MU-MIMO scheduling on the selected RB, such as PF scheduling, RR scheduling, MCI scheduling, and so on.

For example, in this step, if the recorded correspondence between the UE and the DM-RS port and the correspondence between the Rank corresponding to the UE are shown in table 3, as described above, when SU-MIMO scheduling or/and MU-MIMO scheduling is performed on the selected RB, UE1 and UE5 cannot be scheduled at the same time, and UE2 and UE3 cannot be scheduled at the same time. Also, in order to ensure that the Rank of all RBs allocated to the same UE is the same, a UE (UE3 or UE5) corresponding to Rank2 and a UE (UE1, UE2 or UE4) corresponding to Rank3 cannot be scheduled at the same time.

UE	UE1	UE2	UE3	UE4	UE5
						DM-RS port	Port#0	Port#1	Port#1	Port#2	Port#0
Rank	Rank3	Rank3	Rank2	Rank3	Rank2

TABLE 3

In practical application, the corresponding relation between the UE and the DM-RS port can be recorded by respectively configuring a DM-RS port register for each UE, wherein the DM-RS port register is used for recording a DM-RS port corresponding to the UE; and respectively configuring a Rank register for recording the Rank corresponding to each UE to record the corresponding relationship between the UE and the corresponding Rank.

It should be noted that the correspondence between the UE and its corresponding Rank is also established in the resource allocation process. That is, before resource allocation is performed, all UEs do not have a corresponding Rank, that is, the recorded corresponding relationship between the UEs and the Rank is null. After each scheduling result meeting the constraint condition 1 and the constraint condition 2 is obtained, the corresponding relation between the UE and the Rank can be recorded according to the scheduling result.

Step 203: and allocating corresponding DM-RS ports for the UE which is not allocated with the corresponding DM-RS ports according to the selected scheduling result, recording the corresponding relationship between the newly established UE and the DM-RS ports, determining corresponding Rank for the UE which is not allocated with the corresponding Rank according to the selected scheduling result, recording the corresponding relationship between the newly established UE and the Rank, and then returning to the step 201 until all RBs are allocated.

As described above, in this step, the corresponding DM-RS ports may be allocated to the UEs that have not been allocated with the corresponding DM-RS ports in an ascending, descending or random manner, so as to ensure that the DM-RS ports corresponding to different UEs sharing the RB are different. In addition, the corresponding Rank can be determined for the UE which does not have the corresponding Rank directly according to the number of the UE scheduled on the RB.

For example, if the previously recorded correspondence between the UE and the DM-RS port is shown in table 3, the step 102 is executed to obtain the scheduling result of scheduling the UE2, the UE4 and the UE6 on the RB. Wherein, the UE2 has been allocated with a corresponding DM-RS Port #1, and the corresponding Rank is Rank 3; the UE3 has been assigned a corresponding DM-RS Port #2, the corresponding Rank is Rank3, and the UE6 has not been assigned a corresponding DM-RS Port, nor a corresponding Rank. Then in this step the UE6 will be assigned its corresponding DM-RS Port, e.g., Port # 3. And the UE6 determines the Rank, namely Rank 3. After step 203 is executed, the obtained recorded correspondence between the UE and the DM-RS port and the correspondence between the UE and the Rank are shown in table 4.

UE

UE1

UE2

UE3

UE4

UE5

UE6

DM-RS port

Port#0

Port#1

Port#2

Port#0

Port#3

Rank

Rank3

Rank2

Rank3

Rank2

Rank3

TABLE 4

According to the resource allocation method, the corresponding relation between the UE and the DM-RS port is recorded, so that whether DM-RS port conflicts among different UEs exist or not can be judged when SU-MIMO scheduling or/and MU-MIMO scheduling is carried out, and the scheduling result meeting the limiting condition 1 is obtained. In addition, by recording the corresponding relation between the UE and the corresponding Rank, whether the number of the scheduled UEs is the same as the Rank corresponding to the UEs can be judged when SU-MIMO scheduling or/and MU-MIMO scheduling is carried out, so that the scheduling result meeting the condition 2 is obtained.

Example 3

As described above, when allocating RBs to a non-transparent UE, the restrictions of the restriction condition 1 and the restriction condition 2 need to be satisfied, that is, DM-RS ports of all RBs allocated to the same UE need to be the same and Rank of all RBs allocated to the same UE needs to be the same.

The execution process of the resource allocation method described in this embodiment is shown in fig. 3, and mainly includes the following steps:

step 301: a value of Rank is selected and the ranks of all RBs to be allocated are set equal to the value.

In this step, a Rank value can be selected from all possible Rank values in an ascending, descending or random manner.

Step 302: one RB is selected from all RBs to be allocated.

Step 303: and scheduling on the selected RB according to the value of the selected Rank, and selecting one scheduling result meeting the limiting condition 1 from the scheduling results according to the recorded corresponding relation between the UE and the DM-RS port.

In this step, the scheduling is SU-MIMO scheduling or/and MU-MIMO scheduling.

In this step, the sum of the Rank of all UEs that satisfy scheduling on the RB when SU-MIMO scheduling or/and MU-MIMO scheduling is performed is the Rank value set in step 301.

In this step, after obtaining a scheduling result through SU-MIMO scheduling or/and MU-MIMO scheduling, first, it is determined whether there is a DM-RS port conflict between scheduled UEs according to the recorded correspondence between the UEs and DM-RS ports, if there is a DM-RS port conflict, the scheduling result is considered not to satisfy the constraint of constraint 1, the scheduling result is discarded, and SU-MIMO scheduling or/and MU-MIMO scheduling is performed on the RB again until obtaining a scheduling result satisfying the constraint of constraint 1. As described above, a variety of user scheduling methods may be employed for SU-MIMO scheduling or/and MU-MIMO scheduling on the selected RBs, such as PF scheduling, RR scheduling, MCI scheduling, and so on.

Step 304: and allocating the corresponding DM-RS port for the UE which is not allocated with the corresponding DM-RS port according to the selected scheduling result, recording the newly established corresponding relation between the UE and the DM-RS port, returning to the step 302 until all RBs are allocated, and then executing the step 305.

As described above, in this step, the corresponding DM-RS ports may be allocated to the UEs that have not been allocated with the corresponding DM-RS ports in an ascending, descending or random manner, so as to ensure that the DM-RS ports corresponding to different UEs sharing the RB are different.

Step 305: recording the resource allocation result corresponding to the Rank value, then returning to step 301 until a resource allocation result is obtained for all possible Rank values, and then executing step 306.

Step 306: and comparing the resource allocation results corresponding to different Rank values, and taking the allocation result with the best selective performance as a final resource allocation result.

In this step, the best performance result may be the highest priority allocation result or the highest throughput allocation result.

According to the resource allocation method, the corresponding relation between the UE and the DM-RS port is recorded, so that whether DM-RS port conflicts among different UEs exist or not can be judged when SU-MIMO scheduling or/and MU-MIMO scheduling is carried out, and the scheduling result meeting the limiting condition 1 is obtained. In addition, the Rank value of the RB is preset, so that the Rank corresponding to all the UE is the same during the resource allocation, and the scheduling result meeting the condition 2 is obtained.

In the above embodiments, the RB allocation is taken as an example for description, and it should be noted that the resource allocation method provided by the present invention may also be directly applied to the allocation process of other frequency domain resources, for example, the allocation process of subcarriers, Component Carriers (CCs), subbands, or the like, that is, the allocation of other frequency domain resources can be realized by directly replacing the RB in embodiments 1 to 3 with other frequency domain resources. In the present invention, for convenience of description, the frequency domain resources such as RBs, subcarriers, aggregated carriers, and subbands are collectively referred to as a frequency domain resource unit.

In addition to the resource allocation method, the present invention also provides a resource allocation apparatus for implementing the method, as shown in fig. 4, the resource allocation apparatus mainly includes:

the resource selection module is used for selecting one frequency domain resource unit from all frequency domain resource units to be allocated until all the frequency domain resource units are allocated; as described above, the resource selection module may select the frequency domain resource units from all the frequency domain resource units to be allocated by various methods;

a user scheduling module, configured to perform scheduling on the selected frequency domain resource unit, and select a scheduling result that meets the constraint condition 1 from the scheduling results according to the recorded correspondence between the UE and the DM-RS port;

Corresponding to the foregoing embodiment 1, the correspondence recording module may include a DM-RS port register configured for each UE, and configured to record a DM-RS port corresponding to the UE.

Corresponding to the foregoing embodiment 2, the correspondence recording module may further include a Rank register configured for each UE to record a Rank corresponding to the UE. At this time, the user scheduling module is used for performing SU-MIMO scheduling or/and MU-MIMO scheduling on the selected frequency domain resource unit, and selecting a scheduling result meeting the constraint condition 1 and the constraint condition 2 from the scheduling results according to the recorded corresponding relationship between the UE and the DM-RS port and the recorded corresponding relationship between the UE and the Rank.

In addition, as shown in fig. 5, the resource allocation apparatus according to the above embodiment 3 further includes, in comparison with the resource allocation apparatus shown in fig. 4:

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A method for resource allocation, comprising:

2. The resource allocation method according to claim 1,

further comprising, prior to performing A:

a0, selecting a Rank value, and setting the ranks of all frequency domain resource units to be allocated equal to the value;

further comprising, after performing C:

d, recording a resource allocation result corresponding to the Rank value, then returning to A0 until a resource allocation result is obtained for all possible Rank values, and then executing E; and

e, comparing the resource allocation results corresponding to different Rank values, and taking the allocation result with the best selective performance as a final resource allocation result; wherein,

the scheduling on the selected frequency domain resource unit comprises: and carrying out single-user multiple-input multiple-output SU-MIMO scheduling and/or multi-user multiple-input multiple-output MU-MIMO scheduling according to the selected Rank value, wherein the sum of the scheduled ranks of the UE is equal to the selected Rank value.

3. The resource allocation method according to claim 1 or 2, wherein the B comprises:

a1, carrying out SU-MIMO and/or MU-MIMO scheduling on the selected frequency domain resource unit and obtaining a scheduling result;

4. The method of claim 1, wherein the correspondence between the UE and the DM-RS port recorded before the resource allocation is null.

5. A method for resource allocation, comprising:

6. The resource allocation method according to claim 5, wherein the B comprises:

b1, performing single-user multiple-input multiple-output SU-MIMO or/and multiple-user multiple-input multiple-output MU-MIMO scheduling on the selected frequency domain resource unit, and obtaining a scheduling result;

if so, taking the scheduling result as the selected scheduling result;

otherwise, the scheduling result is discarded and B1 is returned.

7. The method of claim 1 or 5, wherein allocating the corresponding DM-RS port to the UE which has not allocated the corresponding DM-RS port comprises: and allocating the corresponding DM-RS ports to the UE which is not allocated with the corresponding DM-RS ports in an ascending, descending or random mode, so as to ensure that the DM-RS ports corresponding to different UEs which are scheduled on the selected frequency domain resource unit are different.

8. The method of claim 1 or 5, wherein recording the newly established correspondence between the UE and the DM-RS port comprises: and respectively configuring a DM-RS port register for recording a DM-RS port corresponding to the UE for each UE, and recording the newly established corresponding relation between the UE and the DM-RS port.

9. The method of claim 5, wherein determining the Rank corresponding to the UE without the Rank comprises: and determining corresponding Rank for the UE without corresponding Rank according to the number of the UE scheduled on the selected frequency domain resource unit.

10. The resource allocation method according to claim 5, wherein recording the newly established correspondence between the UE and the Rank comprises: and respectively configuring a Rank register for recording the Rank corresponding to each UE for each UE, and recording the newly established corresponding relationship between the UE and the Rank.

11. The method of claim 5, wherein the recorded correspondence between the UE and the DM-RS port before resource allocation is null, and the recorded correspondence between the UE and the Rank is null.

12. The method of claim 1 or 5, wherein selecting one frequency-domain resource unit from all resource block frequency-domain resource units to be allocated comprises: selecting a frequency domain resource unit with the highest weighted sum or the highest priority or the highest throughput from all frequency domain resource units to be distributed; or randomly selecting one frequency domain resource unit from all the frequency domain resource units to be allocated.

13. The method according to claim 1 or 5, wherein the scheduling adopts proportional fair PF scheduling algorithm or round robin RR scheduling algorithm or maximum carrier-to-interference ratio (MCI) scheduling algorithm.

14. The method according to claim 1 or 5, wherein the frequency domain resource units are Resource Blocks (RBs), subcarriers, aggregated carriers or subbands.

15. A resource allocation apparatus, comprising:

16. The apparatus according to claim 15, wherein the correspondence recording module comprises: and a DM-RS port register which is respectively configured for each UE and used for recording the DM-RS port corresponding to the UE.

17. The apparatus for resource allocation according to claim 16, wherein the correspondence relation recording module further comprises: the Rank register is respectively configured for each UE and used for recording the Rank register corresponding to the UE; wherein,

the user scheduling module is used for carrying out single-user multi-input multi-output SU-MIMO or/and multi-user multi-input multi-output MU-MIMO scheduling on the selected frequency domain resource unit, selecting a scheduling result from the scheduling results according to the recorded corresponding relation between the user equipment UE and the demodulation pilot signal DM-RS port and the corresponding relation between the UE and the Rank, and ensuring that the DM-RS ports of all frequency domain resource units allocated to the same UE are the same and the Rank of all frequency domain resource units allocated to the same UE is the same.

18. The apparatus for resource allocation according to claim 15, further comprising: