WO2011009405A1

WO2011009405A1 - Method, device and system for allocating physical cell id (pci)

Info

Publication number: WO2011009405A1
Application number: PCT/CN2010/075338
Authority: WO
Inventors: 曲秉玉; 万蕾; 官磊
Original assignee: 华为技术有限公司
Priority date: 2009-07-23
Filing date: 2010-07-21
Publication date: 2011-01-27
Also published as: CN101965057A; CN101965057B

Abstract

The embodiments of the present invention provide a method, device and system for allocating Physical Cell ID (PCI). The embodiments relate to the method, device and system which comprise: when a UE accesses a network, a carrier is determined for data transmission and the PCI is allocated for the carrier; and/or when the carrier for data transmission is increased, the PCI is allocated for the increased carrier; and/or when the carrier for data transmission is reduced, the PCI is released for the reduced carrier. Through the flexible allocation for PCIs, the embodiments save the amount of PCI in the HeNB network, thus reducing the collision possibility among the PCIs, and further achieving better effect on interference randomization.

Description

Method, device and system for allocating physical cell identifier PCI

This application claims priority to Chinese Patent Application No. 200910108963.2, entitled "A Method, Apparatus and System for Assigning Physical Cell Identity PCI" to the Chinese Patent Office on July 23, 2009, the entire contents of which are hereby incorporated by reference. The citations are incorporated herein by reference. Technical field

Embodiments of the present invention relate to communication technologies, and in particular, to a method, device, and system for allocating a physical cell identifier PCI. Background of the invention

In the LTE system, different cells are distinguished by 504 PCI (Physical Cell IDs). The system scrambles the transmission data according to the PCI generated pseudo-random sequence, allocates the resource mapping manner, and determines the uplink codeword. If a PCI collision occurs, that is, multiple base stations use the same PCI scrambled signal overlap, data demodulation errors will result.

In order to improve the data rate, the aggregate carrier technology is introduced in the LTE-A system. In order to be compatible with the LTE system, each carrier needs to allocate one PCI regardless of whether or not data is transmitted, that is, allocate a fixed PCI to the macro base station. This method of allocation increases the amount of PCI used.

After the introduction of a CSG (Closed Subscriber Group) cell, the home base station (HeNB) may be used in large quantities. The macro base station allocates part of the PCI to the HeNB, and each HeNB needs to allocate one PCI for each carrier used by the UE. In this case, it will continue to increase the PCI footprint. Since the macro base station allocates to the HeNB and the available PCI is limited, in the case where the HeNB is used in a large amount, a more serious PCI collision is caused. Summary of the invention

The embodiments of the present invention provide a method, a device, and a system for allocating a PCI, so as to avoid the inability of the PCT to be indispensable. An embodiment of the present invention provides a method for allocating a physical cell identifier PCT, including: when a UE accesses a network, determining a carrier for performing data transmission, and allocating a PCI for the determined carrier; and/or

When the carrier for data transmission is increased, PCI is allocated for the added carrier; and/or when the carrier for data transmission is reduced, the PCI of the reduced carrier is released.

The embodiment of the invention provides a base station, which includes:

a first determining module, configured to determine, when the UE accesses the network, a carrier that performs data transmission, where the first allocation module is configured to allocate a PCI to the carrier determined by the first determining module; and/or

a second allocation module, configured to allocate PCI for the increased carrier when adding a carrier for data transmission; and/or

And a first release module, configured to release the PCI of the reduced carrier when reducing a carrier for data transmission.

A method, device and system for allocating PCI are provided by embodiments of the present invention. By allocating PCI only for carriers with data transmission, it avoids the situation that PCI is still occupied when the carrier is not transmitting data, so as to avoid PCI shortage caused by the shortage of available PCI. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a schematic diagram of allocating PCI according to an embodiment of the present invention;

2 is a schematic diagram of allocating PCI according to an embodiment of the present invention;

3 is a schematic diagram of a base station according to an embodiment of the present invention;

4 is a schematic diagram of a system according to an embodiment of the present invention. Mode for carrying out the invention

FIG. 1 is a schematic diagram of allocating PCI according to an embodiment of the present invention. The method for allocating PCI provided in this embodiment includes:

Step 101: When the UE accesses the network, determine a carrier for performing data transmission, where the carrier is the carrier. Step 102: When adding a carrier for data transmission, allocate a PCI for the carrier; and/or

Step 103: When reducing the carrier for data transmission, release the PCI of the carrier.

This embodiment is applicable to the process of allocating PCI to component carriers in an aggregated carrier. The executive body of this embodiment may be, for example, a base station.

When the UE accesses the network, the base station in the embodiment determines the carrier for data transmission, and allocates PCI for the carrier; when adding the carrier for data transmission, allocates PCI for the carrier; when reducing the carrier for data transmission, The PCI of the above carrier is released, and the released PCI can be allocated to other carriers of other base stations. When the PCI that releases the carrier is enabled again, different PCIs that are originally released can be allocated. After increasing the carrier for data transmission, the UE can obtain CRS (Common Reference Signal) for data demodulation and measurement through the newly allocated PCI. Each step in this embodiment can be used alone or in combination with other steps. This will not happen if the carrier without data transmission still occupies one PCI. This solves the problem of insufficient PCI for the number of PCIs available for distribution. FIG. 2 is a schematic diagram of allocating PCI according to an embodiment of the present invention. The method for allocating PCI provided in this embodiment includes:

Step 201: When the UE accesses the network, determine a carrier for performing data transmission, and allocate PCI for the carrier; and/or

Step 202: When adding a carrier for data transmission, allocate PCI for the carrier; and/or

Step 203: When reducing the carrier for data transmission, release the PCI of the carrier.

When the UE accesses the network, the base station in this embodiment determines the carrier for data transmission, which is The carrier allocation PCT; when adding a carrier for data transmission, assigning a PCT to the carrier; when reducing a carrier for data transmission, releasing the PCI of the carrier, the released PCI may be allocated to other carriers of other base stations, when released When the PCI of the carrier is enabled again, it is possible to allocate different PCIs that were originally released.

When the PCI is allocated, it may be led by the base station, for example, excluding the PCI that has been used by the neighboring base station from the candidate PCI set, selecting the PCI, and associating with the carrier for data transmission; or selecting the PCI from the candidate PCI set. And associated with the carrier for data transmission, if a PCI conflict occurs, reselect and associate until the PCI conflict does not occur; or may be dominated by the operation management and maintenance OAM system, for example, the base station sends an allocation request to the operation management and maintenance OAM system, The PCI received by the OAM system is received and associated with the carrier for data transmission. At this time, the base station only relays the PCI allocated by the OAM system.

In the two base station-based allocation methods, the base station needs to select PCI. When PCI is selected, the PCI can be independently selected. For example, when the UE accesses the network, it is determined that two carriers are to be transmitted. They are assigned 0 and 2, or 2 and 8, for example, when the UE adds a carrier, the original carrier of a data transmission, PCI is 0, and now the added PCI is assigned 1 or 9 for the carrier; or choose another one with itself The PCI used for the data transmission carrier is the same PCI, such as the carrier of the original data transmission or another determined carrier, the PCI is 0, and now the new carrier is also assigned 0; or the carrier with another data transmission is selected. The PCI is separated by a specific value of PCI, such as the carrier of the original data transmission or another determined carrier, the PCI is 0, and now the new carrier is also assigned 0 + n, n is an arbitrary integer; or choose another data transmission with itself. The carrier uses the PCI of the same group of PCI, and the 504 PCI is divided into 17 groups for every 30 groups, which are divided into another 'J is 0 - 29, 30 - 59, and 480 - 504. For example, the carrier of the original data transmission or another determined carrier, PCI is 1, the PCI is in the first group, and now the new carrier is also assigned the PCI in the first group, that is, 0 - 29; or choose another The PCI used for the data transmission carrier uses the same group but not the same PCI, such as the carrier of the original data transmission or another determined carrier, PCI is 1, this PCI is in the first group, now the new one The wave also assigns PCTs other than 1 in the first group, ie 0, 2 - 29.

When the PCI that has been used by the base station is excluded, the PCI that has been detected by the UE and is used by the neighboring base station, and is deleted from the candidate PCI set, for example, the UE finds that the neighboring cell is using the PCI 3, Sending this information to the base station, after receiving the base station, it deletes 3 from its own candidate PCI set; or the base station itself installs a receiver, receives the signal transmitted by the nearby base station, and parses out the PCI, from the candidate PCI. Remove from the collection. Each step in this embodiment can be used alone or in combination with other steps.

This will not happen if the carrier without data transmission still occupies one PCI. Therefore, the problem that the number of available PCIs is insufficient to aggravate the PCI conflict, the possibility of PCI collision is reduced, and the effect of random interference randomization is achieved, and the present invention selects another carrier for data transmission with itself. The PCI of the same group but not the same PCI can further reduce the cubic Cu CM value. 3 is a schematic diagram of a base station according to an embodiment of the present invention. The base station provided in this embodiment includes: a first determining module 301, configured to determine a carrier for performing data transmission when the UE accesses the network, where the first allocating module 302 is configured to allocate a PCI for the carrier determined by the first determining module; / or

a second allocation module 303, configured to allocate PCI for the carrier when adding a carrier for data transmission; and/or

a first release module 304, configured to release the PCL of the carrier when reducing a carrier for data transmission

The first distribution module or the second distribution module may further include:

The first exclusion module 305 is configured to exclude, from the candidate PCI set, the PCI that has been used by the neighboring base station, the first selection module 306 is configured to select the PCI, and the first association module 307 is configured to use the carrier for transmitting the PCI and performing data transmission. Associated; or

The second selection module 308 is configured to select a PCI from the to-be-selected PCI set, and the second association module 309 is configured to associate the PCI with the carrier for performing data transmission, and the first detection module 310 is configured to detect The first sending module 311 is configured to send an allocation request to the operation management and maintenance OAM system, the first receiving module 312 is configured to receive the PCI fed back by the OAM system, and the third association module 313 is configured to transmit the PCI and the carrier for performing data transmission. Association.

The first exclusion module includes:

The second receiving module 314 is configured to receive, by the UE, the PCI that has been used by the neighboring base station, and the first deleting module 315 is configured to exclude the reported PCI from the candidate PCI set; or

The first monitoring module 316 is configured to monitor the PCI that has been used by the neighboring base station, and the second deleting module 317 is configured to exclude the monitored PCI from the candidate PCI set.

The first selection module or the second selection module is used for:

Optional PCI; or

Select the same PCI as the PCI used by another carrier that performs data transmission; or select a PCI with a specific value from the PCI used by another carrier that performs data transmission; or

Selecting the PCI of the same group as the PCI used by another carrier that performs data transmission, or selecting the same group of PCIs as the PCI used by another carrier that performs data transmission, but the PCL provided by the embodiment of the present invention is used for the aggregation carrier. The member carrier is allocated during the PCI process.

The base station in this embodiment is used to implement the embodiment shown in FIG. 1 and FIG. 2, and details are not described herein. 4 is a schematic diagram of a system according to an embodiment of the present invention. The system provided in this embodiment includes:

The OAM system 401 is configured to send, to the base station, a PCI set to be selected or a PCI to be allocated;

The base station 402 is configured to: when the UE accesses the network, determine a carrier for performing data transmission, allocate a PCI for the determined carrier; and/or allocate a PCI for the carrier when adding a carrier for performing data transmission; and/or reduce When the carrier of data transmission, the PCI of the above carrier is released.

The system provided in this embodiment of the present invention is used to allocate PCI for component carriers in an aggregate carrier. Process.

The base station in this embodiment is used to implement the embodiment shown in FIG. 1 and FIG. 2, and details are not described herein. Through the description of the above embodiments, those skilled in the art can clearly understand that the present invention can be implemented by hardware, or by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including The thousands of instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform the methods described above in accordance with various embodiments of the present invention.

A person skilled in the art can understand that the drawings are only a schematic diagram of a preferred embodiment, and the modules or processes in the drawings are not necessarily required to implement the invention.

Those skilled in the art can understand that the modules in the apparatus in the embodiments may be distributed in the apparatus of the embodiment according to the embodiment, or may be correspondingly changed in one or more apparatuses different from the embodiment. The modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.

The serial numbers of the embodiments of the present invention are merely for the description, and do not represent the advantages and disadvantages of the embodiments.

The above disclosure is only a few specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

Rights request

A method for allocating a physical cell identifier PCI, comprising:

When the UE accesses the network, determining, for the UE, a carrier for data transmission, and allocating PCI for the determined carrier; and/or

2. The method for allocating PCI according to claim 1, wherein the allocating PCI for the determined carrier comprises:

Excluding the PCI that has been used by the neighboring base station from the candidate PCI set, selecting PCI for the determined carrier, and associating the selected PCI with the determined carrier; or

Selecting a PCI for the determined carrier from the candidate PCI set, and associating the selected PCI with the determined carrier, and if a PCI collision occurs, reselecting another PCI for the conflicting carrier And associated until no PCI conflict occurs; or

An allocation request is sent to the operation management maintenance OAM system, the PCI fed back by the OAM system is received, and the feedback PCI is associated with the determined carrier.

3. The method of allocating PCI for the increased carrier according to claim 1, wherein the allocating PCI for the added carrier comprises:

Excluding the PCI that has been used by the neighboring base station from the candidate PCI set, selecting PCI for the added carrier, and associating the selected PCI with the added carrier; or

Selecting a PCI for the added carrier from the candidate PCI set, and associating the selected PCI with the added carrier, and if a PCI collision occurs, reselecting another PCI and associating for the conflicting carrier, Until there is no PCI conflict; or

An allocation request is sent to the operations management maintenance OAM system, the PCI fed back by the OAM system is received, and the fed back PCI is associated with the added carrier.

4. The method for allocating PCI according to claim 2, wherein the selecting the PCI for the determined carrier comprises:

Selecting PCI independently of each other for the determined carrier; or

Selecting the same PCI for the determined carrier; or

Selecting a PCI separated by a specific value for the determined carrier; or

Selecting the same set of PCIs for the determined carriers; or

Selecting the same group but not the same PCI for the determined carriers.

The method for allocating PCI according to claim 2, wherein the reselecting another PCI comprises:

Select a PCI that has not been previously selected for the carrier of the collision; or

Select a PCI group of the same group as the previously selected PCI for the conflicting carrier.

6. The method of allocating PCI according to claim 3, wherein said selecting PCI for the added carrier comprises:

Select PCI of PCI that is used independently of another carrier for data transmission; or select the same PCI as the PCI used by another carrier that performs data transmission; or select PCI that is used by another carrier that performs data transmission. a specific value of PCI; or

Select the PCI of the same group as the PCI used by another carrier that performs data transmission; or select the same group but not the same as the PCI used by another carrier that performs data transmission.

PCI.

The method for allocating PCI according to claim 2 or 3, wherein the PCI used by the neighboring base station is: The PCT reported by the UE that has been used by the neighboring base station; or,

By listening to the learned PCI that has been used by neighboring base stations.

8. A base station, comprising:

The base station according to claim 8, wherein the first allocation module comprises:

a first exclusion module, configured to exclude, from the candidate PCI set, a PCI that has been used by the neighboring base station, where the first selection module is configured to separately select a PCI for the determined carrier, and the first association module is configured to: The outgoing PCI is associated with the determined carrier; or

a second selection module, configured to select a PCI for the determined carrier from the candidate PCI set, and a second association module, configured to associate the selected PCI with the determined carrier, where a detection module for detecting a PCI conflict; or

a first sending module, configured to send an allocation request to the operation management and maintenance OAM system, a first receiving module, configured to receive a PCI fed back by the OAM system, and a third association module, configured to: use the feedback PCI and the determined carrier - Association.

10. The base station according to claim 8, wherein the second allocation module comprises:

a second exclusion module, configured to exclude, from the candidate PCI set, a PCI that has been used by the neighboring base station, and a third selection module, configured to separately select a PCI for the added carrier, and a second association module, configured to select the selected The outgoing PCT is associated with the added carrier; or a fourth selecting module, configured to select a PCI for the added carrier from the selected PCT set, and a third association module, configured to associate the selected PCI with the added carrier, and second a detection module for detecting a PCI conflict; or

a second sending module, configured to send an allocation request to the operation management and maintenance OAM system, a second receiving module, configured to receive the PCI fed back by the OAM system, and a third association module, configured to use the feedback PCI and the added carrier - Association.

11. A system for allocating PCI, characterized in that. Includes:

a management operation and maintenance system, configured to send a candidate PCI set or an allocated PCI to a base station, where the base station is configured to determine, when the UE accesses the network, a carrier for performing data transmission, and allocate a PCI for the determined carrier; and/or increase When the carrier of the data transmission, the carrier is allocated PCI; and/or when the carrier for data transmission is reduced, the PCI of the carrier is released.