CN110769513A - Multi-hop relay resource allocation method and device - Google Patents
Multi-hop relay resource allocation method and device Download PDFInfo
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- CN110769513A CN110769513A CN201810852218.8A CN201810852218A CN110769513A CN 110769513 A CN110769513 A CN 110769513A CN 201810852218 A CN201810852218 A CN 201810852218A CN 110769513 A CN110769513 A CN 110769513A
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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
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W40/00—Communication routing or communication path finding
- H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
- H04W40/22—Communication route or path selection, e.g. power-based or shortest path routing using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application discloses a multi-hop relay resource allocation method and a device, comprising the following steps: according to a preset cycle period T, a cycle offset w and an available carrier, carrying out expansion configuration on a Un port return resource corresponding to a system relay RN return subframe mode in advance; for each RN in the system, if the RN is not directly in wired connection with a core network, after entering a UE mode, according to the principle that common-frequency same subframes and different-frequency same subframes are forbidden to be used when a superior relay is accessed, the Un port return resources obtained by the extended configuration are utilized to determine the Un port return resources used when the inferior relay is accessed, and after entering an eNB mode, the determined Un port return resources are broadcasted in a system message. The invention is suitable for multi-hop relay.
Description
Technical Field
The present invention relates to mobile communication technologies, and in particular, to a method and an apparatus for allocating multi-hop relay resources.
Background
In order to improve coverage, improve cell edge throughput, and perform temporary network deployment, the 3GPP system adopts a relay technology. As shown in fig. 1, a relay node RN (relay node) accesses a Donor Cell (Donor Cell) under the control of a Donor enb (Donor enb) through a Un interface, and a UE accesses the RN through a Uu interface.
In 3GPP single-hop Relay, RN node takes the roles of Uu port and Un port client, and needs to coordinate time division multiplexing of the above two resources. The RN node functions as follows:
and (3) RN node: and the Uu port and the Un port are subjected to resource time division multiplexing.
Uu: accessing UE through a Uu port;
un: the RN transmits data back to the DeNB by using the Un backhaul subframe.
Currently, 3GPP only supports 1-hop in-band relay, and does not support multi-hop in-band relay. The networking of multihop relay is shown in figure 2.
Under the multi-hop relay scene, the relay node bears a Uu port, an Nth hop Un port and an N-1 th hop Un port. Time division multiplexing of the above three resources needs to be coordinated. The multi-hop RN functions as follows:
uu: accessing UE through a Uu port;
un (N): receiving data of a Un port of a previous hop;
un (N-1): transmitting the Uu port/previous hop Un port data to the next hop DeNB through Un;
in a multi-hop relay scenario, multiple sets of Un backhaul resources are required for Un resource coordination and interference avoidance. The distribution granularity of the existing 3GPP Un resources is coarse, and only 2 groups of Un return resources exist in a TDD mode, so that the method is not suitable for multi-hop relay.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for allocating multi-hop relay resources, which are suitable for multi-hop relay.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a multi-hop relay resource allocation method comprises the following steps:
according to a preset cycle period T, a cycle offset w and an available carrier, carrying out expansion configuration on a Un port return resource corresponding to a system relay RN return subframe mode in advance;
for each RN in the system, if the RN is not directly in wired connection with a core network, after entering a UE mode, according to the principle that common-frequency same subframes and different-frequency same subframes are forbidden to be used when a superior relay is accessed, the Un port return resources obtained by the extended configuration are utilized to determine the Un port return resources used when the inferior relay is accessed, and after entering an eNB mode, the determined Un port return resources are broadcasted in a system message.
A multi-hop relay resource allocation device is arranged in a relay RN and comprises the following components:
the pre-configuration unit is used for performing extended configuration on the Un port return resource corresponding to the system relay RN return subframe mode in advance according to a preset cycle period T, a cycle offset w and an available carrier;
and the access configuration unit is used for determining the Un port return resource used when the lower-level relay of the RN is accessed by utilizing the Un port return resource obtained by the extended configuration according to the principle that the same-frequency same subframe and different-frequency same subframe are used when the RN is not directly connected with the core network in a wired mode and the RN is not accessed to the upper-level relay, and broadcasting the determined Un port return resource in a system message after the RN enters the eNB mode.
In summary, the multi-hop relay resource allocation method and apparatus provided by the present invention expand the Un port backhaul resource based on the existing RN backhaul subframe pattern of the existing system by using the cycle period, the cycle offset, and the carrier resource, so that the Un port backhaul resource of multiple groups of time division can be used to meet the Un port transmission requirement of the multi-hop relay, avoid mutual interference between receiving and transmitting of the Un port of the same RN, and implement Un port resource coordination and interference avoidance in the multi-hop relay scenario. Therefore, the present invention is applicable to multi-hop relay.
Drawings
Fig. 1 is a schematic diagram of access after relay technology is adopted in a 3GPP system;
fig. 2 is a schematic diagram of a multi-hop relay network;
FIG. 3 is a schematic flow chart of a method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The core idea of the invention is as follows: by increasing the return period and the cyclic offset, the return resources of the Un ports of the system are expanded, and in a multi-carrier scene, the return resources of the Un ports of the same relay are prohibited from using the return resources of the Un ports of the same-frequency same subframe and the same-frequency different subframe, so that the phenomenon that the Un (N-1) port of the same relay transmits interference to the reception of the Un (N) port or vice versa is avoided.
Fig. 3 is a schematic flowchart of a method according to an embodiment of the present invention, and as shown in fig. 3, the method for allocating multi-hop relay resources implemented by the embodiment mainly includes:
Specifically, the Un port backhaul resource may be a TDD Un port backhaul resource or an FDD Un port backhaul resource.
The step is used for further expanding the Un port return resources on the basis of the existing RN return subframe mode of the existing system, namely, the resource distribution granularity is refined by increasing the return period, introducing the cyclic offset and the carrier resources, so that the multi-hop relay can utilize the multi-group time division Un return resources, and the Un port transmission requirement under the multi-hop relay scene can be met.
For example, for a 3GPP FDD RN backhaul subframe: subframe configuration fdd is periodic by 8 ms. The backhaul resources are grouped into 8 groups. In this embodiment, each of the 8 sets of resources of the 3GPP FDD subframe configuration FDD is subdivided, and a frequency domain carrier number is added.
For 3GPP TDD RN backhaul subframes, subframe configuration TDD is periodic with 10 ms. The backhaul resources are divided into 1 or 2 groups. In this embodiment, each of the 1-2 groups of resources of the 3GPP TDD subframe configuration TDD may be subdivided, and a frequency domain carrier number may be added.
Preferably, the expansion configuration may be performed by the following method:
and for each available carrier in the system, determining the Un port return subframe resource corresponding to the carrier in a cycle period according to the cycle period T and the cycle offset w. Further, the following method may be adopted to determine the Un port backhaul subframe resource corresponding to the available carrier within a cycle period:
for each group of Un port backhaul subframes on a wireless frame in the system, in a cycle period, performing w times of cyclic shift on the group of backhaul subframes, and setting the obtained w groups of subframes as corresponding w groups of Un port backhaul subframes of corresponding available carriers in the cycle period.
In practical applications, the cyclic period T, the cyclic offset w and the available carriers can be set by those skilled in the art according to practical needs. For example, in the TDD system, 10ms is used as a subframe offset, and in this case, a cyclic period T may be configured according to T ═ n × 10ms, where n is a natural number, and w ≦ n; in the FDD system, the subframe offset is 8ms, and in this case, the cyclic period T may be configured in accordance with T ═ n × 8 ms.
The parameters can be sent to the RN in a pre-configuration mode or be stored in a network management server in a centralized mode and then sent to the RN when the RN is started.
In step 302, in order to avoid the Un (N-1) transmission interference Un (N) port reception with the RN in the scenario that the RN supports multiple carriers, or vice versa. It is necessary to restrict that two Un ports of the same RN cannot use the same subframe Pattern (Pattern) resource of the same frequency or different frequencies. Therefore, it is necessary to determine the Un port backhaul resource used when the lower relay accesses, by using the Un port backhaul resource obtained by the extended configuration in step 301, according to the principle that the same-frequency same subframe and different-frequency same subframe are prohibited from being used when the upper relay accesses.
Preferably, in order to reduce the interference between two Un ports of the RN as much as possible, the Un port backhaul resource used when the lower relay accesses may be determined according to a principle that the higher relay preferentially uses the inter-frequency-inter-subframe. Namely, the following RN Un port resource selection principle may be adopted in the multi-carrier scenario:
preferably: the resource of the different frequency different sub-frame used when the superior relay is accessed;
suboptimal: the resource of the same frequency different subframe with the resource used when the superior relay is accessed;
selection is forbidden: and the same frequency and same subframe or different frequency and same subframe resources used when the superior relay is accessed.
Specifically, the Un port backhaul resource may be a TDD Un port backhaul resource or an FDD Un port backhaul resource.
Fig. 4 is a multi-hop relay resource allocation apparatus corresponding to the above method, which is disposed in a relay RN, and as shown in fig. 4, the apparatus includes:
the pre-configuration unit is used for performing extended configuration on the Un port return resource corresponding to the system relay RN return subframe mode in advance according to a preset cycle period T, a cycle offset w and an available carrier;
and the access configuration unit is used for determining the Un port return resource used when the lower-level relay of the RN is accessed by utilizing the Un port return resource obtained by the extended configuration according to the principle that the same-frequency same subframe and different-frequency same subframe are used when the RN is not directly connected with the core network in a wired mode and the RN is not accessed to the upper-level relay, and broadcasting the determined Un port return resource in a system message after the RN enters the eNB mode.
Preferably, the pre-configuration unit is configured to determine, for each available carrier in the system, a Un port backhaul subframe resource corresponding to the carrier in a cycle period according to the cycle period T and the cycle offset w; the determining includes: for each group of Un port backhaul subframes on a wireless frame in the system, in a cycle period, performing w times of cyclic shift on the group of backhaul subframes, and setting the obtained w groups of subframes as corresponding w groups of Un port backhaul subframes of corresponding available carriers in the cycle period.
Preferably, the Un port backhaul resource used when the lower relay accesses is determined according to a principle that the different frequency subframe is used when the upper relay is preferentially accessed.
Preferably, the Un port backhaul resource is a TDD Un port backhaul resource or an FDD Un port backhaul resource.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A multi-hop relay resource allocation method is characterized by comprising the following steps:
according to a preset cycle period T, a cycle offset w and an available carrier, carrying out expansion configuration on a Un port return resource corresponding to a system relay RN return subframe mode in advance;
for each RN in the system, if the RN is not directly in wired connection with a core network, after entering a UE mode, according to the principle that common-frequency same subframes and different-frequency same subframes are forbidden to be used when a superior relay is accessed, the Un port return resources obtained by the extended configuration are utilized to determine the Un port return resources used when the inferior relay is accessed, and after entering an eNB mode, the determined Un port return resources are broadcasted in a system message.
2. The method of claim 1, wherein the extended configuration comprises:
for each available carrier in the system, determining a Un port return subframe resource corresponding to the carrier in a cycle period according to the cycle period T and the cycle offset w;
the determining includes:
for each group of Un port backhaul subframes on a wireless frame in the system, in a cycle period, performing w times of cyclic shift on the group of backhaul subframes, and setting the obtained w groups of subframes as corresponding w groups of Un port backhaul subframes of corresponding available carriers in the cycle period.
3. The method of claim 1, wherein the Un port backhaul resource used for the access of the subordinate relay is determined according to a principle of using inter-frequency-inter-subframe preferentially with the access of the superior relay.
4. The method of claim 1, wherein the Un port backhaul resource is a TDD Un port backhaul resource or an FDD Un port backhaul resource.
5. A multi-hop relay resource allocation device provided in a relay RN, comprising:
the pre-configuration unit is used for performing extended configuration on the Un port return resource corresponding to the system relay RN return subframe mode in advance according to a preset cycle period T, a cycle offset w and an available carrier; t is n × 10 ms; w is less than or equal to n;
and the access configuration unit is used for determining the Un port return resource used when the lower-level relay of the RN is accessed by utilizing the Un port return resource obtained by the extended configuration according to the principle that the same-frequency same subframe and different-frequency same subframe are used when the RN is not directly connected with the core network in a wired mode and the RN is not accessed to the upper-level relay, and broadcasting the determined Un port return resource in a system message after the RN enters the eNB mode.
6. The apparatus according to claim 5, wherein the pre-configuration unit is configured to determine, for each available carrier in the system, a Un port backhaul subframe resource corresponding to the carrier within a cycle period according to the cycle period T and the cycle offset w; the determining includes: for each group of Un port backhaul subframes on a wireless frame in the system, in a cycle period, performing w times of cyclic shift on the group of backhaul subframes, and setting the obtained w groups of subframes as corresponding w groups of Un port backhaul subframes of corresponding available carriers in the cycle period.
7. The apparatus of claim 5, wherein the Un port backhaul resource used for the access of the subordinate relay is determined according to a principle of using inter-frequency-inter-subframe preferentially with the access of the superior relay.
8. The apparatus of claim 6, wherein the Un port backhaul resource is a TDD Un port backhaul resource or an FDD Un port backhaul resource.
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| US20130090055A1 (en) * | 2010-06-17 | 2013-04-11 | Nec Corporation | Radio communication system and control method of radio resource allocation |
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| CN102484511A (en) * | 2009-10-04 | 2012-05-30 | 上海贝尔股份有限公司 | Method and apparatus for determining the inter-cell interference in a wireless relay network |
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