CN102413571A - Equipment and method for distribution of downlink relay backhaul resources - Google Patents
Equipment and method for distribution of downlink relay backhaul resources Download PDFInfo
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- CN102413571A CN102413571A CN2010102993519A CN201010299351A CN102413571A CN 102413571 A CN102413571 A CN 102413571A CN 2010102993519 A CN2010102993519 A CN 2010102993519A CN 201010299351 A CN201010299351 A CN 201010299351A CN 102413571 A CN102413571 A CN 102413571A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
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Abstract
The invention provides downlink backhaul resource distribution equipment applied to a relay communication system. The equipment comprises: a receiving unit, which is use for receiving a data buffer occupation level feedbacked by a relay node and channel situation information feedbacked by the relay node; a calculating unit, which is used for calculating a resource demand of the relay node according to the data buffer occupation level; a distribution unit, which is used for distributing resources to the relay node according to the calculated resource demand of the relay node and the channel situation information; and a sending unit, which is used for sending the resource distribution information to the relay node through a control channel. In addition, the invention also provides a downlink relay backhaul resource distribution method applied to the relay communication system. According to the equipment and the method for distribution of the downlink backhaul resources in the invention, link qualities of a backhaul link and an access link are considered and actual service volume demands are met; and moreover, resource distribution of a relay node and macro UE is optimized.
Description
Technical field
The present invention relates to wireless communication field, be specifically related to a kind of descending backhaul resources distributing equipment and method that is used for relay communications system.
Background technology
In the follow-up evolution of LTE (LTE-A), use the relaying technique can the elevator system performance, for example can improve the coverage, group mobility, casual network deployment, cell edge throughput of high data rate etc., the covering of new region perhaps is provided.List of references 1 (3GPP TR 36.814v9.0.0) has detailed description to this.
(Relay Node is RN) via host sub-district (Donor cell) and Radio Access Network wireless connections for via node.According to the frequency spectrum scope of application of via node, can the operation of via node be sorted out as follows:
Operation in the-band: evolved base station (Evolved Node B, eNB)-link and via node-subscriber equipment (User Equi pment, the carrier frequency that link sharing UE) is identical of via node.In this situation, Rel-8UE should be connected to the host sub-district.
The outer operation of-band: the link of eNB-via node is worked on different carrier frequencies with the link of via node-UE.In this situation, Rel-8UE should be connected to the host sub-district.
For two kinds of modes of operation of relaying in the band and the outer relaying of band, the link of eNB-via node should be worked on identical carrier frequency with the link of eNB-UE.
In LTE-A, " Type 1 " via node is a kind of interior via node of band with following characteristic:
-can control a plurality of sub-districts, each sub-district is the independent sub-district that is different from the host sub-district at UE;
-a plurality of sub-districts have the physical district ID (in LTE Rel-8, defining) of himself, and via node sends synchronizing channel, the reference symbol of himself, or the like;
-in the environment of single cell operation, directly (Hybrid Automatic Repeat Request HARQ) feeds back UE, and its control channel is sent to via node with mixing automatic repeat requests from via node receiving scheduling information;
-Rel-8UE regards " Type 1 " via node as Rel-8eNB (that is backward compatibility);
-for LTE-A UE, should regard " Type 1 " via node as different with Rel-8eNB, to allow further performance boost.
For " Type 1 " via node; Because the transmitter of via node may cause interference to the receiver of this via node self; Therefore; Only if isolate outgoing signal and Incoming signal fully (for example by means of antenna structure specific, good), carry out the transmission of eNB-via node and the transmission of via node-UE on the identical carrier resource simultaneously otherwise be difficult to be implemented in.Similarly, via node possibly send signal to eNB when receiving the UE transmission.
A kind of possibility scheme that addresses the above problem be: when supposition receives data at via node from host eNB (that is, the current eNB that service is provided for via node), do not send data to the terminal; That is, in the transmission of via node-UE, create " gap ".As shown in fig. 1; Can be through configuration Multicast Broadcast Single Frequency Network (Multicast Broadcast Single Frequency; MBSFN) subframe is created " gap " (during this period, suppose terminal can not carry out any and transfer of data via node), and these subframes are called as the backhaul subframe.Subframe with beyond the journey subframe is called as the access subframe, and in inserting subframe, data communication can be carried out with via node in the terminal.Like this, through in some subframe, forbidding the transfer of data between terminal and the via node, for the transmission of via node-eNB is provided convenience.
Normally used interference model 200 in the LTE-A standardization body has been shown among Fig. 2; Comprise a plurality of eNB 201, via node 202, grand subscriber equipment (Marco User Equipment; MUE; Promptly by UE that eNB served) 203 and trunk subscriber equipment (Relay User Equipment, RUE) 204.As shown in Figure 2, in relaying backhaul subframe, eNB 201 also is MUE 203 data dispatchings simultaneously.Interference in these backhaul subframes is from eNB 201.In inserting subframe, eNB 201 is to MUE 203 transmission data, and via node 202 is to RUE204 transmission data.Interference in these access subframes is from eNB 201 and RN 202.Show expectation link and interfering link respectively to backhaul subframe and access subframe among Fig. 2.
In 3GPP LTE-A, relaying is the important technology that is used for the Extended Cell coverage and the capacity of lifting.For relaying in the band, the back haul link of via node uses identical frequency range with access link with macrocell.Some subframes in the radio frames are configured to the backhaul subframe, are used for the transfer of data from host eNB to via node.In these backhaul subframes, host eNB maybe be also to grand UE transmission data.How shared resource becomes challenging problem between via node and grand UE.
List of references 2 (3GPP RAN1#60; R1-101273, Panasonic, " Downlink Relay Performance Evaluation; " In February, 2010; San Francisco) propose in, eNB calculates the resource size (being the number of RB) of each via node according to the number of the relaying UE of the number of grand UE and each via node, makes the resource size of distributing to each UE become equal.Illustrated among Fig. 3 in the prior art by the process sketch map of eNB to the via node Resources allocation.Particularly, as shown in Figure 3, at 301 places, via node feeds back to its host eNB with the number of its UE that serves.Then at 302 places, host eNB calculates the resource size of RN according to the number of UE, makes the resource size of distributing to each UE become equal.At 303 places, before grand UE Resources allocation, host eNB distributes to RN with the resource size of being calculated.At last, at 304 places, host eNB is sent to via node via certain specific control channel with resource allocation information.
Yet, because the number of relaying UE possibly can't correctly reflect the traffic needs of via node, also can't reflect the channel quality of relaying access link, it is inaccurate therefore only coming Resources allocation based on the number of UE.
Summary of the invention
In order to address the above problem, the present invention proposes: at first confirm the resource requirement of each via node according to the data buffer usage level of via node, demand and the channel conditions according to each via node distributes adequate resources then.
According to an aspect of the present invention, a kind of descending backhaul resources distributing equipment that is used for relay communications system is provided, comprising: receiving element is used to receive via node feedback data buffer occupancy level and channel condition information; Computing unit is used for the resource requirement of calculating via node according to feedback data buffer occupancy level; Allocation units are used for resource requirement and channel condition information according to the via node that calculates, to the via node Resources allocation; And transmitting element, be used for resource allocation information is sent to via node via control channel.
Preferably, to the via node Resources allocation, the resource that makes via node use minimizes allocation units according to the resource requirement of via node and channel condition information.
Preferably; Allocation units are according to the resource requirement and the channel condition information of via node; To the via node Resources allocation that resource requirement is not met, make the minimum via node of ratio of current Resources allocation and institute's request resource obtain to have in the current resource resource of peak transfer rate.
Preferably, allocation units are after the via node Resources allocation, to the remaining resource of grand user equipment allocation.
Preferably, data buffer takies the queue length that level comprises the data bit in the data buffer.
Preferably, channel condition information comprises Signal to Interference plus Noise Ratio information or channel quality information.
Preferably, control channel comprise the relaying Physical Downlink Control Channel (Relay-Physical Downlink Control Channel, R-PDCCH).
Preferably, resource comprises Physical Resource Block.
According to a further aspect in the invention, a kind of descending backhaul resources distribution method that is used for relay communications system is provided, has comprised: received via node feedback data buffer occupancy level and channel condition information; The resource requirement of calculating via node according to feedback data buffer occupancy level; According to the resource requirement and the channel condition information of the via node that calculates, to the via node Resources allocation; And resource allocation information is sent to via node via control channel.
Preferably, to the via node Resources allocation, the resource that makes via node use minimizes according to the resource requirement of via node and channel condition information.
Preferably; Resource requirement and channel condition information according to via node; To the via node Resources allocation that resource requirement is not met, make the minimum via node of ratio of current Resources allocation and institute's request resource obtain to have in the current resource resource of peak transfer rate.
Preferably, after the via node Resources allocation, to the remaining resource of grand user equipment allocation.
Preferably, data buffer takies the queue length that level comprises the data bit in the data buffer.
Preferably, channel condition information comprises Signal to Interference plus Noise Ratio information or channel quality information.
Preferably, control channel comprises the relaying Physical Downlink Control Channel.
Preferably, resource comprises Physical Resource Block.
According to another aspect of the invention, a kind of base station that comprises descending backhaul resources distributing equipment of the present invention is provided.
Descending backhaul resources distributing equipment of the present invention and method are considered the link-quality of back haul link and access link, can satisfy actual traffic needs, and optimize the resource allocation between relaying and the grand UE.
Description of drawings
Through the hereinafter detailed description with the accompanying drawing, above-mentioned and further feature of the present invention will become more apparent, wherein:
Fig. 1 shows and uses conventional subframe to carry out the communication of via node-UE and the sketch map that uses the MBSFN subframe to carry out the communication of eNB-via node;
Fig. 2 shows the sketch map of normally used interference model in the LTE-A standardization body;
Fig. 3 shows eNB in the prior art distributes process sketch map from backhaul resources to via node;
Fig. 4 shows the block diagram of descending according to an embodiment of the invention backhaul resources distributing equipment;
Fig. 5 shows the process sketch map that descending according to an embodiment of the invention backhaul resources is distributed; And
Fig. 6 shows the flow chart of descending according to an embodiment of the invention backhaul resources distribution method.
Embodiment
Below, in conjunction with the drawings to the description of specific embodiment of the present invention, principle of the present invention will become obvious with realizing.Should be noted in the discussion above that the present invention should not be limited to specific embodiment hereinafter described.In addition, for for simplicity, omitted the description of not having the known elements and the step of direct correlation with the present invention.
Fig. 4 shows the block diagram of descending according to an embodiment of the invention backhaul resources distributing equipment 40.As shown in Figure 4, descending backhaul resources distributing equipment 40 comprises receiving element 402, computing unit 404, allocation units 406 and transmitting element 408.Below, describe the operation of each assembly in the descending backhaul resources distributing equipment 40 in detail in conjunction with accompanying drawing 5.It should be noted that in Fig. 5, be comprised in this end of host eNB according to the descending backhaul resources distributing equipment 40 of present embodiment.
At first, 501 places in Fig. 5, the receiving element 402 among the host eNB receives by via node (RN) feedback data buffer occupancy level and channel condition information, and is sent to computing unit 404.In one embodiment, data buffer takies the queue length that level is the data bit in the data buffer, and channel condition information is Signal to Interference plus Noise Ratio information or channel quality information.
502 places in Fig. 5, the computing unit 404 among the host eNB takies the resource requirement that level is calculated each via node according to the data buffer of via node, and this result of calculation is sent to allocation units 406 together with channel condition information.For example, computing unit 404 can calculate the resource requirement of each via node through following mode:
At first, the resource requirement C of each via node of initialization
r(r representes the sequence number of via node).
If contain queue length in the data buffer of via node r, then establish q greater than 0 bit
r=queue length (unit is a bit); Otherwise,, then establish q if the formation of via node r is empty
rEmpty Physical Resource Block of=-((Physical Resource Block, the estimation of the bit number that can carry on PRB)).
Upgrade C
r=C
r-q
r, final C
rThe upper limit can not surpass the queue length of via node r in the eNB buffer, lower limit can not be less than 0.
It more than is prediction to the transmittability and the demand of via node.Obviously, the buffer usage level of via node has very directly reflected this point.If the data in the buffer are many more, explain that the transmittability of this via node is poor more, so should reduce data allocations to it; Otherwise, if free Physical Resource Block PRB explains that then this via node can transmit more data, should increase its resource allocation.The target of final optimization pass is that the formation of hoping buffer levels off to 0.
503 places in Fig. 5; The resource requirement and the channel conditions of each via node that the allocation units 406 among the host eNB are calculated according to computing unit 404; Before grand UE Resources allocation, distributing adequate resources to via node earlier, to minimize the PRB that uses in the backhaul subframe.For example, allocation units 406 can come to the via node Resources allocation through following mode:
At first, establish
Target is:
Satisfy constraints:
x
m∈{0，1}，r＝1，2，...，R；n＝1，2，..，N (3)
Wherein,
N representes the number of the RPB in the subframe;
R representes the number of via node;
X=[x
Rn] expression PRB is to the allocation matrix of via node;
B representes system bandwidth;
N
0The expression noise power spectral density;
P representes the power of PRB;
h
RnThe channel gain of via node r among the expression PRB n;
Note; The capacity of the corresponding PRB of
(Ym just) expression in the equality (1), this is to calculate according to the Signal to Interference plus Noise Ratio of via node to draw.In concrete the realization, this part can be replaced from adaptive function by employed link.x
RnIf be 1, represent that then via node r is scheduled on PRB n, thereby can take this resource; On the contrary, x
RnIf be 0, represent that then via node r is not scheduled on this PRB.In addition, equality (3) has embodied x
RnConstraint.This shows the c in the equality (1)
RnThe actual speed rate of expression via node r on PRB n.Equality (2) is intended to through choose reasonable the PRB sum that the allocation matrix X of via node makes all via nodes use is minimum.Equality (4) explains that a PRB can only be used by maximum via nodes simultaneously.Inequality (5) shows that the resource (data bit that transmits with prediction is represented) of distributing to each via node must satisfy the demand of via node.
Therefore, the descending backhaul resources distribution principle in the present embodiment is: through ability and the optimize resource allocation of accurately estimating via node, under the prerequisite of the demand that satisfies each via node, the resource that via node is used minimizes.
After via node distributes adequate resources, allocation units 406 can be given grand UE with the resource allocation of remainder.This distribution can use existing dispatching technique to realize, no longer details here.
At last, 503 places in Fig. 5, the transmitting element 408 among the host eNB is sent to via node with resource allocation information via certain specific control channel.In one embodiment, this control channel is the relaying Physical Downlink Control Channel.
It may be noted that the angle from concrete realization, the above-mentioned optimum allocation process that allocation units 406 are carried out is not efficient on calculating.Therefore, in concrete the realization, in allocation units 406, carry out suboptimum assigning process (Local Search) alternatively, to reduce amount of calculation.Below with this suboptimum assigning process of formal specification of false code:
If Ω
rIt is the set of distributing to the PRB of via node r;
Initialization: establish x
Rn=0, Ω
r=φ, A={1,2 ..., N}; While A ≠ φ
The value that finds
is minimum via node r;
if
Search and satisfy constraints Y
Rn>=Y
Rj, the n of j ∈ A;
If x
Rn=1, upgrade c
Rn, Ω
r=Ω
r∪ { n}, A=A-{n};
else
break；
end?if
end?while
Wherein, Ω
rExpression has been assigned to the set of the RPB of via node r, and A representes the set of the PRB that this moment is remaining.When initialization, resource also is not assigned with.Afterwards, get into circulation, just finish after demands intact up to resource allocation or all via nodes are satisfied.In circulation each time, at first select to have the minimum via node (being the minimum relatively via node of resource allocation rate) of ratio of current Resources allocation and institute's request resource, to guarantee justice.For this via node, if existing distribution can not be satisfied the demand that is provided with in advance, then in remaining PRB, seek the PRBn that can maximize transmission rate, indicate this PRB then, upgrade correlated variables and set.Get into next circulation then.
Above-mentioned suboptimum assigning process is attempted being complementary each via node with the PRB with maximization transmission rate (maximum Signal to Interference plus Noise Ratio) as much as possible, and has guaranteed certain fairness.The computation complexity of this suboptimum assigning process is low, on calculating, is efficient therefore.In addition, the suboptimum assigning process has solved the problem that above-mentioned constraints inequality (5) possibly can't be satisfied very naturally.After all resource allocations were accomplished, the suboptimum assigning process finished, although inequality (5) possibly not be all to be able to set up for all via nodes, the suboptimum assigning process can guarantee to make existing resource to satisfy the demand of via node to greatest extent.
Fig. 6 shows the flow chart of descending according to an embodiment of the invention backhaul resources distribution method 60.As shown in Figure 6, method 60 begins at step 602 place.
In step 604, receive by via node (RN) feedback data buffer occupancy level and channel condition information.In one embodiment, data buffer takies the queue length that level is the data bit in the data buffer, and channel condition information is Signal to Interference plus Noise Ratio information or channel quality information.
In step 606, take the resource requirement that level is calculated each via node according to the data buffer of via node.In one embodiment, data buffer takies the queue length that level is the data bit in the data buffer.
In step 608, according to the demand and the channel conditions of each via node that is calculated, before grand UE Resources allocation, distributing adequate resources to via node earlier, to minimize the PRB that uses in the backhaul subframe.Particularly, can be through carrying out optimum allocation process mentioned above or suboptimum assigning process to the via node Resources allocation.After via node distributes adequate resources, can give grand UE with the resource allocation of remainder again.
In step 610, resource allocation information is sent to via node via certain specific control channel.In one embodiment, this control channel is the relaying Physical Downlink Control Channel.
At last, method 60 finishes at step 612 place.
Descending backhaul resources distributing equipment of the present invention and method are considered the link-quality of back haul link and access link, can satisfy actual traffic needs, and optimize the resource allocation between via node and the grand UE.
Although below combined the preferred embodiments of the present invention to show the present invention, one skilled in the art will appreciate that under the situation that does not break away from the spirit and scope of the present invention, can carry out various modifications, replacement and change to the present invention.Therefore, the present invention should not limited the foregoing description, and should be limited accompanying claims and equivalent thereof.
Claims (17)
1. descending backhaul resources distributing equipment that is used for relay communications system comprises:
Receiving element is used to receive via node feedback data buffer occupancy level and channel condition information;
Computing unit is used for the resource requirement of calculating via node according to feedback data buffer occupancy level;
Allocation units are used for according to resource requirement and the channel condition information calculated, to the via node Resources allocation; And
Transmitting element is used for resource allocation information is sent to via node via control channel.
2. descending backhaul resources distributing equipment according to claim 1, wherein, said allocation units to the via node Resources allocation, make occupied backhaul resources minimize according to the resource requirement of being calculated and channel condition information.
3. descending backhaul resources distributing equipment according to claim 1; Wherein, Said allocation units make the minimum via node of ratio of current Resources allocation and institute's request resource obtain to have in the current resource resource of peak transfer rate to the via node Resources allocation that resource requirement is not met.
4. descending backhaul resources distributing equipment according to claim 1, wherein, said allocation units are after the via node Resources allocation, to the remaining resource of grand user equipment allocation.
5. descending backhaul resources distributing equipment according to claim 1, wherein, said data buffer takies the queue length that level comprises the data bit in the data buffer.
6. descending backhaul resources distributing equipment according to claim 1, wherein, said channel condition information comprises Signal to Interference plus Noise Ratio information or channel quality information.
7. descending backhaul resources distributing equipment according to claim 1, wherein, said control channel comprises the relaying Physical Downlink Control Channel.
8. descending backhaul resources distributing equipment according to claim 1, wherein, said resource comprises Physical Resource Block.
9. descending backhaul resources distribution method that is used for relay communications system comprises:
Receive via node feedback data buffer occupancy level and channel condition information;
The resource requirement of calculating via node according to feedback data buffer occupancy level;
According to resource requirement and the channel condition information calculated, to the via node Resources allocation; And
Resource allocation information is sent to via node via control channel.
10. descending backhaul resources distribution method according to claim 9 wherein, to the via node Resources allocation, makes occupied backhaul resources minimize according to the resource requirement of being calculated and channel condition information.
11. descending backhaul resources distribution method according to claim 9; Wherein, Resource requirement and channel condition information according to via node; To the via node Resources allocation that resource requirement is not met, make the minimum via node of ratio of current Resources allocation and institute's request resource obtain to have in the current resource resource of peak transfer rate.
12. descending backhaul resources distribution method according to claim 9, wherein, after the via node Resources allocation, to the remaining resource of grand user equipment allocation.
13. descending backhaul resources distribution method according to claim 9, wherein, said data buffer takies the queue length that level comprises the data bit in the data buffer.
14. descending backhaul resources distribution method according to claim 9, wherein, said channel condition information comprises Signal to Interference plus Noise Ratio information or channel quality information.
15. descending backhaul resources distribution method according to claim 9, wherein, said control channel comprises the relaying Physical Downlink Control Channel.
16. descending backhaul resources distribution method according to claim 9, wherein, said resource comprises Physical Resource Block.
17. a base station comprises according to any described descending backhaul resources distributing equipment among the claim 1-8.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102993519A CN102413571A (en) | 2010-09-21 | 2010-09-21 | Equipment and method for distribution of downlink relay backhaul resources |
| PCT/CN2011/075730 WO2012037819A1 (en) | 2010-09-21 | 2011-06-14 | Device and method for allocating downlink relay backhaul resources |
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|---|---|---|---|
| CN2010102993519A CN102413571A (en) | 2010-09-21 | 2010-09-21 | Equipment and method for distribution of downlink relay backhaul resources |
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| CN103813388A (en) * | 2012-11-05 | 2014-05-21 | 上海贝尔股份有限公司 | Method and apparatus for achieving resource control based on relay node |
| CN110073705A (en) * | 2016-10-21 | 2019-07-30 | 诺基亚通信公司 | Resource allocation in cellular network |
| CN110278609A (en) * | 2018-03-16 | 2019-09-24 | 诺基亚技术有限公司 | The method, apparatus and computer storage medium of link adaptation are used in communication system |
| EP3735793A4 (en) * | 2018-01-08 | 2021-01-20 | Samsung Electronics Co., Ltd. | Apparatus and method for allocating resources in wireless communication system |
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| WO2012037819A1 (en) | 2012-03-29 |
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Application publication date: 20120411 |