WO2011157120A2

WO2011157120A2 - Access control method, device and system for node b cache

Info

Publication number: WO2011157120A2
Application number: PCT/CN2011/074952
Authority: WO
Inventors: 周涛
Original assignee: 华为技术有限公司
Priority date: 2011-05-31
Filing date: 2011-05-31
Publication date: 2011-12-22
Also published as: CN102918880A; WO2011157120A3; CN102918880B

Abstract

An access control method, device and system for Node B cache are disclosed in the present invention, which relates to the field of communication technology and improves hit ratio of the Node B cache. The method includes that: a source Node B receives a request message transmitted by a terminal, wherein the request message carries a content identification; when the content matching the content identification does not exist in the source Node B cache, the source Node B searches a target Node B which stores the content matching the content identification; and the source Node B transmits the request message carrying the content identification to the target Node B. The embodiments of the present invention mainly apply to the processing of performing content access on the Node B cache. DRAWING:

Description

Base station cache access control method, device and system

The present invention relates to the field of communications technologies, and in particular, to an access control method, apparatus, and system for a base station cache.

Background technique

Currently, the Cache (Network Information Buffer) technology is applied to the base station to cache the content of the remote server that the user terminal needs to access in the Cache of the base station, so as to improve the access speed of the user and reduce the network bandwidth. For example, in LTE

(Long Term Evolution, Long Term Evolution), WIMAX ( Worldwide Interoperability for Microwave Acces ss, Global Interoperability for Microwave Access) and other eNodeb (evolved base stations) under fourth-generation wireless communication systems can directly apply Cache technology; or, in UMTS (Universal Mobile Te 1 ecommun i ca t ions Sys tem, Universal Mobile Telecommunications System), TDS-CDMA (Time Division Synchronous

- CDMA, Time Division Synchronous CDMA), CDMA (Code D ivisi on Mu 11 ip 1 e Accece ss, Code Division Multiple Access), etc. Flattened base stations in third generation wireless communication systems or implement G i Offload (G interface offload) The Cache technology is applied to the base station.

In the prior art, taking the UMTS standard in the third generation wireless communication system as an example, the flow of the base station applying the Cache technology to the user to provide the content cache service is as follows: Assume that the current base station of the service terminal is the base station A, then, if the terminal needs The content of the access is not in the Cache of the base A, and the access is obtained by the content server of the Internet through the Gi Offload 3⁄4; if the content that the terminal needs to access is matched in the Cache of the base station A, Obtaining the access content from the Cache of the base station A; if the content that the terminal needs to access belongs to the non-offload service type, the original path of the radio access network is adopted by the RNC (Radio Network Cont ro 11 er, radio network controller) / The content server of the Internet accessed by the xGSN obtains the content of the access, and then the content is pushed by the RNC to the Cache of the base station A; or accesses the cache of the RNC or the cache of the xGSN through the original path of the wireless access network to obtain the access content, and obtain the access. After the content, the RNC pushes the content to the Cache of the base station A.

However, when Cache is deployed on an existing base station, the number of users served by a single base station is usually small, and the degree of dispersion of the access base station is high, so that the Cache hit rate of the base station is low. In order to ensure the hit rate of the Cache of the base station, a larger capacity memory needs to be configured for each base station Cache, thereby increasing the hardware cost of the base station.

Summary of the invention

Embodiments of the present invention provide a method, an apparatus, and a system for access control of a base station cache, which improve a hit rate of a base station Cache.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

In one aspect, an access control method for a base station cache is provided, including:

The source base station receives the request sent by the terminal carrying the content identifier, and

When there is no content matching the content identifier in the source base station cache, searching for a target base station storing content that matches the content identifier;

Sending a request carrying the content identifier to the target base station; Xiao, .

In one aspect, a communication device is provided, including:

a receiving unit, configured to receive a request for carrying the content identifier sent by the terminal, and a searching unit, configured to: when the content of the communication device cache does not match the content identifier, search and store the content identifier The target base station of the matched content;

And a sending unit, configured to send, to the target base station, a request message that carries the content identifier.

In another aspect, a distributed base station cache system is provided, including: at least two base stations, where the base station is provided with a cache;

The base station is configured to receive a request message that is sent by the terminal and that carries the content identifier; when there is no content that matches the content identifier in the base station cache, the target base station that stores the content that matches the content identifier is searched; Sending a request message carrying the content identifier to the target base station.

In the embodiment of the present invention, the buffers of the multiple base stations are shared. After the source base station receives the content identifier sent by the terminal, if the content matching the content identifier does not exist in the source base station cache, the search and storage are performed. The content identifies a target base station of the matched content, and the target base station The target base station sends a request message carrying the content identifier to facilitate obtaining content matching the content identifier from the target base station. That is, when the terminal does not obtain the content in the buffer of one base station, it can also obtain the information from the cache of the other base station. Compared with the prior art, the number of users served by the single base station is relatively small, resulting in a cache hit rate of the base station. In the low aspect, the embodiment of the present invention improves the hit rate of the base station cache, and does not need to upgrade the cache of the base station to a larger capacity, thereby reducing the hardware requirement for deploying the cache on the base station.

DRAWINGS

FIG. 1 is a flowchart of a method for controlling access control of a base station cache according to an embodiment of the present invention; FIG. 2 is a flowchart of another access control method for a base station cache according to an embodiment of the present invention;

FIG. 3 is a flowchart of still another method for access control of a base station cache according to an embodiment of the present invention;

FIG. 4 is a flowchart of still another access control method for a base station cache according to an embodiment of the present invention;

FIG. 5 is a first structural diagram of a communication apparatus according to an embodiment of the present invention;

FIG. 6 is a second structural diagram of a communication device according to an embodiment of the present invention;

FIG. 7 is a first structural diagram of another communication apparatus according to an embodiment of the present invention; FIG. 8 is a second structural diagram of another communication apparatus according to an embodiment of the present invention; a structural diagram of a base station system;

FIG. 10 is a structural diagram of another base station system according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention. Rather than all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

As shown in FIG. 1 , an embodiment of the present invention provides a method for controlling access of a base station cache, where the method is performed by a source base station, including:

101. The source base station receives, by the terminal, a request for carrying the content identifier, where

The source base station is a current base station of the serving terminal.

102. When there is no content matching the content identifier in the source base station cache, look up a target base station that stores content that matches the content identifier.

The target base station is: a base station that can communicate with the source base station.

For example, the source base station and the target base station are base stations in a certain area using a Mesh (Wireless Grid) networking mode. Wireless interconnection can be maintained between any two base stations in the Mesh (wireless mesh) networking mode.

103. Send a request message carrying the content identifier to the target base station.

After receiving the request message carrying the content identifier, the target base station acquires content that matches the content identifier, and sends the content to the source base station, where the source base station sends the content to the terminal.

The embodiment of the present invention provides an application scenario: when the hit rate of the base station Cache is reached to 50%, the required memory capacity is 3 TB. Assuming that Cache services of the same hit rate are required in 100 base stations, a total of 300 TB of memory needs to be deployed among 100 base stations when using the prior art. With the method provided by the embodiment of the present invention, a 3TB capacity memory can be distributed in 100 base stations, that is, a total of 3TB of memory needs to be deployed in 100 base stations. Therefore, the hardware investment of deploying the cache on the base station is effectively reduced, and the terminal can access the content on the Cache of any one of the 100 base stations, that is, the terminal can share the content of the 100 base station Caches, thereby achieving and deploying 300 TB of memory. The same effect and hit rate.

It can be seen that, in the embodiment of the present invention, after the source base station receives the content identifier sent by the terminal, if there is no content matching the content identifier in the cache of the source base station, the content identifier is searched and stored. The target base station of the matched content and sent to the target base station The content identifier request message is configured to obtain content matching the content identifier from the target base station. That is, when the terminal does not obtain content in the buffer of one base station, it can also acquire from the cache of other base stations, and the caches of the multiple base stations are shared. Compared with the prior art, the number of users served by a single base station is relatively small, resulting in a lower cache hit rate of the base station. Compared with the method, the embodiment of the present invention improves the hit rate of the base station cache, and does not need to upgrade the cache of the base station to a larger one. Capacity, which in turn reduces the hardware requirements for deploying caches on the base station.

Further, the source base station and the target base station may further store a content index table, where the content index table includes identifiers and arbitrary contents of all contents stored in the source base station cache and the target base station cache. A base station identifier corresponding to a content identifier.

At this time, in the foregoing step 102, when there is no content matching the content identifier in the source base station cache, the target base station that stores the content that matches the content identifier may specifically adopt the following implementation manner: When there is no content matching the content identifier in the source base station cache, the target base station identifier corresponding to the content identifier is searched in the content index table.

Specifically, in the foregoing step 102, when there is no content matching the content identifier in the source base station cache, if at least two base station identifiers corresponding to the content identifier are found in the content index table, And selecting, by the at least two base station identifiers corresponding to the content identifier, a base station identifier as the target base station identifier.

Further, in order to ensure the consistency of the content index table stored on the source base station and the target base station, if the content in the base station buffer is changed, the content index table needs to be synchronized between the source base station and the target base station. Specifically, as shown in FIG. 2, the above method may further include at least one of steps 1 04 and 156:

When the content of the source base station is deleted, the existing content identifier is deleted in the content index table saved by the source base station, and the changed content index table is sent to the target base station to indicate that the target base station is to be used. The content index table stored on the target base station is synchronously changed to the changed content index table.

When the new content is added to the source base station cache, a new content identifier is added to the content index table saved by the source base station, and the changed content index table is sent to the target base station to indicate the content index table. In addition, in the embodiment of the present invention, if the content that the terminal needs to access is matched in the Cache of the source base station, the access content is directly obtained from the Cache of the source base station;

If the content that the terminal needs to access does not match in the Cache of the source base station, and the source base station does not find the target base station that stores the content matching the content identifier, the content server can continue to the Internet through the Gi Offload. Get access to content;

If the content that the terminal needs to access belongs to the service type of the non-offload, the original content of the wireless access network can be accessed by the MC (Radio Network Controller)/xGSN to access the content server of the Internet. Then, the MC pushes the content to the Cache of the base station A. Alternatively, if the content that the terminal needs to access belongs to the service type of the non-offload, the Cache of the MC or the cache of the xGSN may be accessed through the original path of the wireless access network. After accessing the content and obtaining the access content, the MC pushes the content to the Cache of the base station A.

As shown in FIG. 3, an embodiment of the present invention provides an access control method for a base station cache, where the method is specifically performed by a target base station, including:

301. The target base station receives a request for sending the content identifier sent by the source base station.

302. Acquire, in the target base station cache, content that matches the content identifier.

303. Send the acquired content that matches the content identifier to the source base station, so that the source base station sends the content to the terminal.

In the embodiment of the present invention, the target base station receives the request message carrying the content identifier sent by the source base station, and obtains content that matches the content identifier, and sends the content to the source base station. That is, when the terminal does not obtain the content in the buffer of the source base station, it can also acquire from the cache of other base stations (for example, the target base station), and the caches of the plurality of base stations are shared. Compared with the prior art, the number of users served by a single base station is relatively small, resulting in a lower cache hit rate of the base station. Compared with the method, the embodiment of the present invention improves the hit rate of the base station cache, and does not need to upgrade the cache of the base station to a larger one. Capacity, which in turn reduces the hardware requirements for deploying caches on the base station.

Further, a content index table is stored on the source base station and the target base station, and the content index table includes an identifier and any content of all contents stored in the source base station cache and the target base station cache. Identify the corresponding base station identifier.

Further, optionally, as shown in FIG. 4, the method further includes the steps in steps 304 and 305. at least one:

The target base station receives the changed content index table sent by the source base station, where the changed content index table is obtained after the source base station deletes the existing content identifier in the content index table saved by the source base station; The content index table stored on the target base station is synchronously changed to the changed content index table. Thereby, the content index table saved on the source base station is kept consistent with the content index table saved on the target base station.

305. The target base station receives the changed content index table sent by the source base station, where the changed content index table is obtained by adding, by the source base station, a new content identifier in a content index table saved by the source base station; The content index table stored on the target base station is synchronously changed to the changed content index table. Thereby, the content index table saved on the source base station is kept consistent with the content index table saved on the target base station.

As shown in FIG. 5, an embodiment of the present invention provides a communication device, which is specifically a source base station, and includes: a receiving unit 1 1 , a searching unit 1 2 , and a sending unit 13 .

The receiving unit 1 1 is configured to receive, by the terminal, a request message that carries the content identifier.

The searching unit 1 2 is configured to: when there is no content matching the content identifier in the communication device cache, search for a target base station that stores content that matches the content identifier;

The sending unit 1 3 is configured to send, to the target base station, a request message that carries the content identifier.

In this embodiment, the current base station of the serving terminal is referred to as a source base station. After the source base station receives the content identifier sent by the terminal, if the content matching the content identifier does not exist in the source base station cache, the search and storage are performed. And a target base station that matches the content identifier, and sends a request message carrying the content identifier to the target base station, so as to obtain content that matches the content identifier from the target base station. That is, when the terminal does not obtain content in the buffer of one base station, it can also acquire from the cache of other base stations, and the caches of the multiple base stations are shared. Compared with the prior art, the number of users served by a single base station is relatively small, resulting in a lower cache hit rate of the base station. Compared with the method, the embodiment of the present invention improves the hit rate of the base station cache, and does not need to upgrade the cache of the base station to a larger one. Capacity, which in turn reduces the hardware requirements for deploying caches on the base station. Further, a content index table is stored on the communication device and the target base station, and the content index table includes an identifier and any content of all content stored in the communication device cache and the target base station cache. Identify the corresponding base station identifier.

The searching unit 120 is specifically configured to search for a target base station identifier corresponding to the content identifier in the content index table when there is no content matching the content identifier in the communication device cache.

Further, the searching unit 12 is specifically configured to: when there is no content matching the content identifier in the cache of the communication device, and find at least two base stations corresponding to the content identifier in the content index table. When the identifier is selected, one of the at least two base station identifiers corresponding to the content identifier is selected as the target base station identifier.

Further, in order to ensure the consistency of the content index table stored on the source base station and the target base station, if the content in the base station buffer is changed, the content index table needs to be synchronized between the source base station and the target base station. As shown in FIG. 6, the communication device may further include: at least one of the first synchronization unit 14 and the second synchronization unit 15 .

The first synchronization unit 14 is configured to delete the existing content identifier in the content index table saved by the source base station, and send the changed content index table, when the existing content is deleted in the cache of the communication device Giving the target base station to instruct the target base station to use the second synchronization unit 15 saved on the target base station to use the content index saved at the source base station when new content is added to the communication device cache A new content identifier is added to the table, and the changed content index table is sent to the target base station, to indicate that the target base station saves the content saved on the target base station, as shown in FIG. 7. The embodiment of the present invention provides another communication. The device is specifically a target base station, and includes: a receiving unit 2 1 , an obtaining unit 2 2 and a sending unit 23 .

The receiving unit 2 1 is configured to receive a request message that is sent by the source base station and carries the content identifier.

The obtaining unit 22 is configured to obtain, in the target base station cache, a valley matching the content identifier,

a sending unit 2 3, configured to send the acquired content identifier to the source base station Matching content.

Further, a content index table is stored on the communication device and the source base station, and the content index table includes an identifier and any content of all content stored in the communication device cache and the target base station cache. Identify the corresponding base station identifier.

Further, in order to ensure the consistency of the content index table stored on the source base station and the target base station, if the content in the base station buffer is changed, the content index table needs to be synchronized between the source base station and the target base station. As shown in FIG. 8, the above communication device may further include: at least one of the first synchronization unit 24 and the second synchronization unit 25.

The first synchronization unit 24 is configured to: when the existing content is deleted in the cache of the communication device, delete the existing content identifier in the content index table saved by the source base station, and send the changed content index table to The target base station is configured to instruct the target base station to use the target base station to protect the second synchronization unit 25, where the content index table saved at the source base station is added when new content is added to the source base station cache. The new content identifier is added, and the changed content index table is sent to the target base station to indicate that the target base station saves the target base station as shown in FIG. 9. The embodiment of the present invention further provides a The base station system includes: a source base station 32 and a target base station 33, and the source base station 32 and the target base station 33 are provided with a buffer;

The source base station 32 is configured to receive a request message that is sent by the terminal and that carries the content identifier. When the content that matches the content identifier does not exist in the source base station cache, the content that matches the content identifier is searched for. a target base station; transmitting, to the target base station, a request message carrying the content identifier, so as to obtain a match with the content identifier from the target base station And transmitting the content to the terminal;

The target base station 33 is configured to receive a request message that is sent by the source base station and that carries the content identifier, obtain content that matches the content identifier in the target base station cache, and obtain the content that is obtained. Sent to the source base station.

As shown in FIG. 10, each base station may become the source base station 32 or the target base station 33. For example, when the base station 3 in FIG. 10 is the source base station 32 and the base station 2 is the target base station 33, if the base station 3 receives the terminal 31. Sending a request message carrying a content identifier; when there is no content matching the content identifier in the cache of the base station 3, searching for a target base station 33 storing content matching the content identifier (in FIG. 10) The base station 2 transmits the request message carrying the content identifier to the base station 2, and the base station 3 acquires the content matched by the content identifier from the cache of the base station 3 according to the request message carrying the content identifier. And sent to the base station 3, which is forwarded by the base station 3 to the terminal 31.

It can be seen that, after the base station receives the content identifier sent by the terminal, if there is no content matching the content identifier in the base station cache, the target base station storing the content matching the content identifier is searched for, and Sending a request message carrying the content identifier to the target base station, so as to obtain content matching the content identifier from the target base station. That is, when the terminal does not obtain content in the buffer of one base station, it can also acquire from the cache of other base stations, and the caches of multiple base stations are shared. Compared with the prior art, the number of users served by a single base station is relatively small, resulting in a lower cache hit rate of the base station. Compared with the method, the embodiment of the present invention improves the hit rate of the base station cache, and does not need to upgrade the cache of the base station to a larger one. Capacity, which in turn reduces the hardware requirements for deploying caches on the base station.

Further, the source base station 32 and the target base station 33 each have a content index table, where the content index table includes an identifier of all content stored in the cache of each base station and a base station identifier corresponding to any content identifier. .

Specifically, a base station system using a Me sh networking mode in a certain area is formed into a base station system. Further, the source base station 32 is specifically configured to search for a target base station identifier corresponding to the content identifier in the content index table when there is no content matching the content identifier in the source base station cache.

Further, the source base station 32 is specifically configured to delete the existing source base station cache And deleting the existing content identifier in the content index table saved by the source base station, and sending the changed content index table to the target base station, to instruct the target base station to target the target The base station 33 is configured to receive the changed content index table sent by the source base station, where the changed content index table is obtained by deleting, by the source base station, the existing content identifier in the content index table saved by the source base station; And changing the content index table stored on the target base station to the changed content index table.

Further, the source base station 32 is specifically configured to: when a new content is added to the source base station cache, add a new content identifier to the content index table saved by the source base station, and send the changed content index table. And the target base station is configured to instruct the target base station to use the target base station 3 3 of the target base station to receive the changed content index table sent by the source base station, where the changed content index table is the source And obtaining, by the base station, a new content identifier in the content index table saved by the source base station; and synchronizing the content index table saved on the target base station to the changed content index table.

In addition, the base station provided by the embodiment of the present invention may be an eNodeb (evolved base station) in a fourth generation wireless communication system such as LTE or WIMAX, or a third generation wireless communication system such as UMTS, TD-SCDMA, and CDMA. Flattened base station or base station implementing G i Of fl oad.

The embodiments of the present invention are mainly applied to the process of performing content access on the base station cache, which can improve the hit rate of the base station Ca che and reduce the hardware requirements for deploying the Ca che on the base station.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims

Claim

An access control method for a base station cache, comprising:

The source base station receives the request for carrying the content identifier sent by the terminal, Xiao, ;

And when there is no content matching the content identifier in the source base station cache, searching for a target base station storing content that matches the content identifier;

Sending a request message carrying the content identifier to the target base station, so as to obtain content matching the content identifier from the target base station, and send the content to the terminal.

The access control method for the base station cache according to claim 1, wherein the source base station and the target base station each have a content index table, and the content index table includes the source base station. And identifying, by the cache, an identifier of all content in the target base station cache and a base station identifier corresponding to any content identifier.

The access control method for the base station cache according to claim 2, wherein when the content matching the content identifier does not exist in the source base station cache, the search and storage matches the content identifier. The target base stations for the content include:

When there is no content matching the content identifier in the source base station cache, the target index of the base station corresponding to the content identifier is searched in the content index table.

The access control method for the base station cache according to claim 3, wherein, when there is no content matching the content identifier in the source base station cache, searching and referring to the content index table The target base station identifier corresponding to the content identifier includes:

When there is no content matching the content identifier in the source base station cache, and at least two base station identifiers corresponding to the content identifier are found in the content index table, from the at least two Any one of the base station identifiers corresponding to the content identifier is used as the target base station identifier.

The access control method for the base station cache according to claim 2, further comprising:

Deleting the existing content identifier in the content index table saved by the source base station, and sending the changed content index table to the target base station to indicate the location The target base station synchronously changes the content index table stored on the target base station to the changed content index table.

Adding a new content identifier to the content index table saved by the source base station, and transmitting the changed content index table to the target base station to indicate the target. The base station synchronously changes the content index table stored on the target base station to the changed content index table.

7. An access control method for a base station cache, comprising:

The target base station receives the request sent by the source base station and carries the content identifier;

Obtaining content matching the content identifier in the target base station cache;

And sending the acquired content that matches the content identifier to the source base station, so that the source base station sends the content to the terminal.

The access control method for the base station buffer according to claim 7, wherein the source base station and the target base station each have a content index table, and the content index table includes the source base station. And identifying, by the cache, an identifier of all content in the target base station cache and a base station identifier corresponding to any content identifier.

The access control method for the base station cache according to claim 8, further comprising:

The target base station receives the changed content index table sent by the source base station, and the changed content index table is obtained by deleting, by the source base station, the existing content identifier in the content index table stored by the source base station;

The target base station receives the changed content index table sent by the source base station, and the changed content index table is obtained by adding, by the source base station, a new content identifier in the content index table saved by the source base station; p

A communication device, comprising:

a receiving unit, configured to receive a request message that is sent by the terminal and that carries the content identifier, where the search unit is configured to match, when the content of the communication device cache does not exist, the search and the content identifier match Target base station for content;

And a sending unit, configured to send, to the target base station, a request message carrying the content identifier, so as to obtain content matching the content identifier from the target base station, and send the content to the terminal.

The communication device according to claim 11, wherein the communication device and the target base station each have a content index table, and the content index table includes a cache stored in the communication device and the The identifier of all content in the target base station cache and the base station target corresponding to any content identifier.

The communication device according to claim 12, wherein the searching unit is configured to: when the content of the communication device cache does not have content matching the content identifier, look up and search in the content index table. The content identifier corresponds to a target base station identifier.

The communication device according to claim 13, wherein the searching unit is configured to: when there is no content matching the content identifier in the communication device cache, and look in the content index table When at least two base station identifiers corresponding to the content identifiers are selected, one of the at least two base station identifiers corresponding to the content identifiers is selected as the target base station identifier.

The communication device according to claim 12, further comprising: a first synchronization unit, configured to: when the content of the communication device deletes existing content, the content index saved by the source base station Deleting the existing content identifier in the table, and sending the changed content index table to the target base station, to indicate that the target base station saves the target base station

The communication device according to claim 12, further comprising: a second synchronization unit, configured to: when the new content is added to the source base station cache, the content index table saved at the source base station Adding a new content identifier, and transmitting the changed content index table to the target base station, to instruct the target base station to synchronously change the content index table saved on the target base station to the changed content index table.

The communication device according to any one of claims 1 to 16, wherein the communication device is specifically a base station.

A communication device, comprising:

a receiving unit, configured to receive a request message that is sent by the source base station and that carries the content identifier, where the acquiring unit is configured to obtain, in the target base station cache, content that matches the content identifier, and a sending unit, configured to send, to the source base station, And obtaining the content that matches the content identifier, so that the source base station sends the content to the terminal.

The communication device according to claim 18, wherein the source base station and the target base station each have a content index table, where the content index table includes the source base station cache and The identifier of all the content in the target base station cache and the base station identifier corresponding to any content identifier.

The communication device according to claim 19, further comprising: a first synchronization unit, configured to receive a changed content index table sent by the source base station, where the changed content index table is And obtaining, by the source base station, the existing content identifier in the content index table saved by the source base station, and synchronizing the content index table stored on the target base station to the changed content index table.

The communication device according to claim 19, further comprising: a second synchronization unit, configured to receive a changed content index table sent by the source base station, where the changed content index table is And obtaining, by the source base station, a new content identifier in the content index table saved by the source base station; and synchronizing the content index table saved on the target base station to the changed content index table.

The communication device according to any one of claims 18 to 21, wherein the communication device is specifically a target base station.

A base station system, comprising: a source base station and a target base station, wherein the source base station and the target base station are provided with a buffer;

The source base station is configured to receive a request message that is sent by the terminal and that carries the content identifier. When the content that matches the content identifier does not exist in the source base station cache, the content that is matched with the content identifier is searched for. Transmitting, by the target base station, a request message carrying the content identifier, to obtain content matching the content identifier from the target base station, And transmitting the content to the terminal;

The target base station is configured to receive a request message that is sent by the source base station and that carries the content identifier, obtain content that matches the content identifier in the target base station cache, and send the obtained content To the source base station.

The base station system according to claim 23, wherein the source base station and the target base station each have a content index table, where the content index table is included in the cache of each base station. The identifier of all content and the base station identifier corresponding to any content identifier.

The base station system according to any one of claims 23 to 24, wherein the source base station and the target base station are connected by Me sh (wireless mesh).