WO2009105986A1

WO2009105986A1 - Method and device for setting system channels

Info

Publication number: WO2009105986A1
Application number: PCT/CN2009/070505
Authority: WO
Inventors: 马小飞; 李元杰; 唐臻飞; 谢明江
Original assignee: 华为技术有限公司
Priority date: 2008-02-26
Filing date: 2009-02-23
Publication date: 2009-09-03
Also published as: CN101521889B; CN101521889A

Abstract

A method and a device for setting system channels in the technical field of communication are provided. Said method includes: dividing bandwidth into sub-bands, said sub-bands include center sub-band and sideband; setting channels in said center sub-band, or setting channels in the center sub-band and the sideband. Said device includes sub-band dividing module and channel setting module. By dividing base station bandwidth into sub-bands and then setting channels in divided sub-bands, said method and said device can allow the low receiving bandwidth terminal to access high bandwidth system, and then can improve the system capability.

Description

METHOD AND APPARATUS FOR SETTING A SYSTEM CHANNEL This application claims priority to Chinese Patent Application filed on Feb. 26, 2008, to the Chinese Patent Office, Application No. 200810100916.9, entitled "A Method and System for Designing a High-Bandwidth System Channel" The entire contents of which are incorporated herein by reference. Say

Technical field

The present invention relates to the field of communications, and in particular, to a method and apparatus for setting a system channel. BACKGROUND OF THE INVENTION

With the development of technology, wireless mobile communication systems are increasingly demanding data transmission rates. In order to increase the data transmission rate, in addition to the increasing requirements for spectrum utilization, the bandwidth requirements are also increasing. The Global Carrier For Mobile Communication (GSM) has a single carrier bandwidth of 200 kHz, and the Wideband Code Division Multiple Access (WCDMA) system has a single carrier bandwidth of 5 MHz, and cooperates in the third generation. The single carrier frequency bandwidth of the 3GPP (The 3rd Generation Partnership Project) Long Term Evolution (LTE) system has been increased to 20 MHz. In the future 4G and above systems, in order to meet the high-speed data transmission requirements, the bandwidth must be improved. It is expected that LTE + bandwidth may reach 100MHz.

For 3.9G and above systems, in order to fully utilize resources, the base station does not need to reach the maximum bandwidth when configured. For example, in an LTE system, the base station may have bandwidths of 1.25 MHz, 2.5 MHz, 5 MHz - up to 20 MHz. While LTE+ bandwidth may reach ΙΟΟΜΗζ, there are bound to be multiple bandwidths for base stations. Accordingly, for the sake of cost, the receiving bandwidth of the terminal is not likely to reach 100 MHz.

As shown in FIG. 1 and FIG. 2, a bandwidth configuration diagram of a bandwidth received by a user equipment (UE) and a base station (BS) is used in the prior art. 1 shows that the receiving bandwidth of the terminal is generally the same as the bandwidth of the base station; FIG. 2 shows the configuration that the receiving bandwidth of the terminal is not less than the bandwidth of the base station. In the prior art, since the terminal reception bandwidth is always not lower than the bandwidth of the base station, there is no problem of setting the channel. However, when a scenario where a low-reception bandwidth terminal accesses a high-bandwidth system occurs, if the channel is not set, the terminal cannot access the system. Summary of the invention

The embodiment of the invention provides a method and a device for setting a system channel, which can solve the problem that the low receiving bandwidth terminal cannot be connected. The problem of entering a high bandwidth system.

The technical solution provided by the embodiment of the present invention is as follows:

A method of setting a system channel, including:

Subbanding the bandwidth, the subband includes a central subband and a sideband;

A channel is set in the center subband, or a channel is set in the center subband and the sideband.

A device for setting a system channel, comprising:

a subband division module, configured to perform subband division on a bandwidth, where the subband includes a central subband and a sideband;

a channel setting module, configured to set a channel in the central subband, or to set a channel in the central subband and the sideband. In the embodiment of the present invention, by dividing the subband of the base station bandwidth and then setting the channel on the divided subband, the low receiving bandwidth terminal can be connected to the high bandwidth system, thereby improving system performance. DRAWINGS

1 is a schematic diagram of a configuration in which a terminal receiving bandwidth is equal to a bandwidth in the prior art;

2 is a schematic diagram of a configuration in which a terminal receiving bandwidth is not lower than a bandwidth in the prior art;

3 is a flowchart of a method for setting a system channel according to an embodiment of the present invention;

4 is a schematic diagram of subband division according to a minimum supported bandwidth of a network according to an embodiment of the present invention;

5 is a schematic diagram of subband division according to a minimum receiving bandwidth of a terminal according to an embodiment of the present invention;

6 is a schematic diagram of subband division according to a preset configuration value according to an embodiment of the present invention;

FIG. 7 and FIG. 8 are schematic diagrams of setting a synchronization channel according to an embodiment of the present invention;

9 and FIG. 10 are schematic diagrams of setting a random access channel according to an embodiment of the present invention;

11 and FIG. 12 are schematic diagrams of setting a broadcast channel according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a complete channel structure according to an embodiment of the present invention; FIG.

FIG. 14 is a schematic diagram of congestion of a sub-band of a terminal access center according to an embodiment of the present invention; FIG.

FIG. 15 is a schematic diagram of a terminal allocated according to a preset policy according to an embodiment of the present invention; FIG.

FIG. 16 is a schematic diagram of an apparatus for setting a system channel according to an embodiment of the present invention. detailed description

In order to make the objects, the technical solutions and the advantages of the present invention more apparent, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

The embodiment of the invention provides a method for setting a system channel, which first divides a subband of a base station bandwidth, and then sets a channel on the divided subband, so that a low receiving bandwidth terminal can access a high bandwidth system, thereby improving the system. performance. Referring to FIG. 3, the method for setting a system channel provided by this embodiment includes:

101: Subband division of base station bandwidth. The sub-bands are divided into the following modes:

First, the subband is divided according to the minimum bandwidth supported by the network.

Assuming that the minimum bandpass bandwidth supported by the network is 1.25 MHz (in practical applications, not limited to 1.25 MHz), the bandwidth of the base station is divided into subbands according to 1.25 MHz. The center of the definition is 1.25Mhz as the center subband, the other 1.25Mhz band is the sideband, and the sideband and the center subband are collectively referred to as the subband. The terminal receiving bandwidth supported by the bandwidth of the base station may be larger than 1.25 Mh _Z. For example, the base station supports a terminal with a bandpass bandwidth of 20 Mhz, as shown in FIG.

Second, subband division is performed according to the minimum reception bandwidth of the terminal.

Assuming that the bandwidth of the base station is 100 MHz, the minimum receiving bandwidth of the terminal is 20 MHz (20 Mhz is only an example, which is not limited in practical applications). The terminal minimum bandwidth of 20Mhz is used as the standard. The bandwidth of the base station is divided into subbands. The center 20MHz is defined as the center subband. The other 20MHz bands are sidebands. The sidebands and the center subband are collectively referred to as subbands, as shown in Figure 5. .

Third, subband division is performed according to a preset configuration value.

It is assumed that the base station supports the receiving of the bandwidth of lOMhz, but subbands the bandwidth of the base station according to the configured 20Mhz, as shown in FIG. 6.

102: Set the channel on the divided subbands.

Wherein, the channel refers to a synchronization channel, a random access channel, and a broadcast channel. The terminal acquires downlink synchronization information through the synchronization channel, initiates random access and resource application through the random access channel, and acquires system information through the broadcast channel. Taking the sub-band division of the minimum receiving bandwidth of the terminal as an example, the descriptions of the synchronization channel, the random access signal, and the broadcast channel are respectively described:

(1) At least the following scheme exists for the design of the synchronization channel:

Solution 1. Set the synchronization channel in the center subband and the synchronization channel in the sideband. See Figure 7, where the black coverage area indicates the synchronization channel.

When the terminal initially enters the system, the downlink synchronization information is first acquired through the synchronization channel of the central sub-band; when the terminal is in the sideband, the downlink reference symbols passing through the sidebands can be kept synchronized. The downlink reference symbol is a specific sequence code that can be synchronized with the synchronization channel of the center subband. Since the downlink reference symbols are transmitted in full frequency, the terminal maintains synchronization through the downlink reference symbols of the sidebands.

Solution 2: Set the synchronization channel in the center subband and set the synchronization channel in the sidebands. See Figure 8. The black coverage area in the figure indicates the synchronization channel.

When the terminal initially enters the system, the downlink synchronization information is first acquired through the synchronization channel of the central sub-band; when the terminal is in the sideband, the synchronization is maintained by the synchronization channel of the sideband. Solution 3: The setting of the synchronization channel is between the scheme 1 and the scheme 2, but does not include the scheme 1 and the scheme 2, that is, the synchronization channel is set in the central subband, and the synchronization channel is randomly set in the sideband.

When the terminal initially enters the system, the downlink synchronization information is first acquired through the synchronization channel of the central sub-band; when the terminal is in the sideband, when the synchronization channel is set by the sideband, the downlink synchronization information is acquired through the synchronization channel set by the sideband, when the sideband does not have When the synchronization channel is set, synchronization is maintained by the downstream reference symbols.

(2) There are at least the following schemes for the design of random access channels:

Solution 1: A random access channel is set in the central sub-band, and a random access channel is not set in the sideband. As shown in FIG. 9, the left oblique line coverage area is a random access channel.

When the terminal initially enters the system, it first initiates random access through the random access channel of the central sub-band to perform uplink synchronization or resource application. When the terminal is in the sideband and needs to initiate random access, it needs to switch to the central sub-band to initiate random access. The receiving band is moved from the sideband to the motion center sub-band, and then uplink synchronization or resource application is performed.

Solution 2: A random access channel is set in both the central subband and the sideband. As shown in FIG. 10, the left oblique line coverage area in the figure is a random access channel.

When the terminal initially enters the system, it first initiates random access from the random access channel of the central sub-band to perform uplink synchronization or resource application. When the terminal is in the sideband, it initiates random access through the random access channel of the sideband to perform uplink synchronization. Or resource application.

Solution 3: The setting of the random access channel is between the first scheme and the second scheme, but does not include the scheme 1 and the scheme 2, that is, the random access channel is set in the central subband, and the random access is randomly set in the sideband. channel.

When the terminal initially enters the system, it first initiates random access from the random access channel of the central sub-band to perform uplink synchronization or resource application. When the terminal is in the sideband, when the sideband sets the random access channel, the random access is set. The channel initiates random access and performs uplink synchronization or resource application. When the sideband does not set a random access channel, the sub-band that sets the random access channel switches to initiate random access, and performs uplink synchronization or resource application.

(3) There are at least three options for the design of the broadcast channel:

First introduce the following concepts:

The cell-related system information refers to information shared by each sub-band, including core network-related information, neighbor list information, and the like; sub-band related system information refers to information unique to each sub-band, for example, random access channel information, some Frequently changing system information that affects the terminal's presence in the sideband, such as neighbor list change information, can also be attributed to subband related system information. The cell-related system information and sub-band related system information are collectively referred to as system information.

The design scheme of the broadcast channel is as follows:

Solution 1: The broadcast channel is set in the central sub-band, and the broadcast channel is not set in the sideband. As shown in FIG. 11, the right oblique line coverage part is a broadcast channel, and the central sub-band includes cell-related system information and all sub-bands. Sub-band related system information. When the terminal initially enters the system, it first acquires cell-related system information and sub-band related system information of the central sub-band from the broadcast channel of the central sub-band; when the terminal is in the sideband, it needs to perceive the change of system information and switch when the system information changes. Go to the center sub-band and get the changed system information. Because the changes are not very frequent, the impact on system performance can be ignored.

In the second scheme, a broadcast channel is set in both the center subband and the sideband. As shown in FIG. 12, the right oblique line overlay portion is a broadcast channel. According to the sub-band containing system information, it can be divided into two situations:

(a) The central sub-band contains cell-related system information and its own sub-band related system information, all sidebands containing cell-related system information and sub-band related system information for the corresponding sidebands.

When the terminal initially enters the system, firstly, the cell-related system information and the sub-band related system information of the central sub-band are acquired from the broadcast channel of the central sub-band; when the terminal is in the sideband, the cell-related system information and the corresponding side are acquired from the sideband broadcast channel. Subband related system information.

(b) The central sub-band contains cell-related system information and its own sub-band related system information, and all sidebands contain sub-band related system information of the corresponding sideband.

When the terminal initially enters the system, firstly, the cell-related system information and the sub-band related system information of the central sub-band are acquired from the broadcast channel of the central sub-band; when the terminal is in the sideband, the change of the cell-related system information needs to be sensed, and the cell-related system When the information changes, the broadcast channel of the central sub-band is switched to acquire the changed cell-related system information.

Scheme 3: The setting for the broadcast is between the scheme 1 and the scheme 2, but does not include the scheme 1 and the scheme 2, that is, the broadcast channel is set in the center subband, and the broadcast channel is randomly set in the sideband. At this time, the center sub The subband related system information including cell related system information and all subbands.

When the terminal initially enters the system, it first acquires cell-related system information and sub-band related system information of the center sub-band from the broadcast channel of the central sub-band; when the terminal is in the sideband, it needs to perceive the change of the system information, and when the system information changes , switch to the center sub-band to get the changed system information. Because the changes are not very frequent, the impact on system performance can be ignored.

In conjunction with the first scheme of setting the synchronization channel, the second scheme of the random access channel, and the second scheme of the broadcast channel, a complete channel structure diagram is shown in the embodiment of the present invention, as shown in FIG. Other combinations are similar to this and will not be described again.

Since the receiving bandwidth of the terminal is smaller than the bandwidth of the base station, FIG. 14 below is an example. The bandwidth of the base station is 100 MHz, the center frequency is fl, and the receiving bandwidth of the terminal is 20 MHz. When the terminal initially accesses the base station, it must access through the central frequency point fl, and then camp on the base station to receive the service. Due to the inconsistency between the terminal receiving bandwidth and the base station bandwidth, there may be a case where the central sub-band resides in the terminal. Assuming that the terminal 1, the terminal 2, and the terminal 3 are connected to the base station, it can be seen from FIG. 14 that the capacity of the center subband of 20 MHz centered on Π has received a large impact, and the remaining 80 MHz bandwidth resources are relatively idle. . Therefore, in order to make full use of bandwidth resources, it is necessary to perform load balancing control of resources by using band switching. Fig. 15 is a schematic diagram showing the terminal being dispersed by band switching. The specific implementation method is: when the terminal accesses After the central sub-band of the base station, the base station guides the terminal to switch to other idle sub-bands according to a preset load control policy. The preset load control policy may be the number of accesses of the terminal. For example, when the number of accesses of the terminal reaches three, the terminal is instructed to switch to other sub-bands.

In the embodiment of the present invention, by dividing the subband of the base station bandwidth and then setting the channel on the divided subband, the low receiving bandwidth terminal can be connected to the high bandwidth system, thereby improving system performance. Based on the same inventive concept of the method embodiment, the embodiment of the present invention further provides an apparatus for setting a system channel. Referring to FIG. 16, the system includes:

a subband division module 1600, configured to perform subband division on a bandwidth, where the subband includes a center subband and a sideband;

A channel setting module 1700 is configured to set a channel in a central subband or to set a channel in a center subband and a sideband.

The channel setting module 1700 specifically sets the channel in the sideband.

Set a synchronization channel on the sideband or randomly set the synchronization channel; or

Setting a random access channel in the sidebands or randomly setting a random access channel; or

Set or randomly broadcast channels on the sidebands.

It should be noted that the detailed process of subband division of the bandwidth by the subband division module 1600 can be referred to 101 of the method embodiment. A detailed procedure for channel setting module 1700 to set up a channel in a subband can be found in 102 of the method embodiment.

In the embodiment of the present invention, by dividing the subband of the base station bandwidth and then setting the channel on the divided subband, the low receiving bandwidth terminal can be connected to the high bandwidth system, thereby improving system performance.

A person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program instructing related hardware, and the program can be stored in a computer readable storage medium, where the storage medium is A computer's floppy disk, hard disk, or CD.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are within the spirit and scope of the present invention, should be included in the protection of the present invention. Within the scope.

Claims

Claim

A method for setting a system channel, comprising:

2. The method for setting a system channel according to claim 1, wherein the dividing the bandwidth subband is performed according to a bandwidth supported by the network or a receiving bandwidth of the terminal or a preset configuration value.

The method of setting a system channel according to claim 1 or 2, wherein the channel is a synchronization channel or a random access channel or a broadcast channel.

4. The method of setting a system channel according to claim 3, wherein the setting the channel in the central subband comprises:

A synchronization channel is provided in the center subband, the sideband including a downlink reference symbol.

The method for setting a system channel according to claim 4, wherein a synchronization channel is set in the central sub-band, and when the sideband includes a downlink reference symbol, when the terminal initially enters the system, from the center The synchronization channel of the subband acquires downlink synchronization information, and when the terminal is in a sideband, acquires the downlink reference symbol from the sideband, and keeps synchronization according to the downlink reference symbol.

The method for setting a system channel according to claim 3, wherein the setting a channel in the central sub-band and the sideband comprises:

Setting the synchronization channel in the central sub-band, and setting the synchronization channel in the sideband; or

The synchronization channel is set in the center subband, and the synchronization channel is randomly set in the sideband.

7. The method of setting a system channel according to claim 6, wherein:

Setting the synchronization channel in the central sub-band, when the synchronization channel is set in the sideband, when the terminal initially enters the system, acquiring downlink synchronization information from the synchronization channel of the central sub-band, when the terminal When in the sideband, obtaining downlink synchronization information from the synchronization channel of the sideband; or Setting the synchronization channel in the central sub-band, when the sideband randomly sets the synchronization channel, when the terminal initially enters the system, acquiring downlink synchronization information from the synchronization channel of the central sub-band, when the terminal When the sideband is in the sideband, if the sideband sets the synchronization channel, the downlink synchronization information is acquired through the synchronization channel, and if the synchronization channel is not set, the downlink synchronization symbol is passed through the sideband Stay in sync.

The method for setting a system channel according to claim 3, wherein the setting a channel in the central subband includes:

The random access channel is set in the central subband.

9. The method of setting a system channel according to claim 8, wherein:

When the random access channel is set in the central sub-band, when the terminal initially enters the system, random access is initiated by using the random access channel of the central sub-band, and when the terminal is in a sideband, switching The random access channel to the central sub-band initiates random access.

10. The method of setting a system channel according to claim 3, wherein the setting a channel in the central sub-band and the sideband comprises:

Setting the random access channel in the central subband, setting the random access channel in the sideband; or setting the random access channel in the central subband, randomly setting in the sideband The random access channel.

11. The method of setting a system channel according to claim 10, wherein:

Setting the random access channel in the central sub-band, when the random access channel is set in the sideband, when the terminal initially enters the system, the random access channel is initiated by the central sub-band Random access, when the terminal is in a sideband, initiate random access through the random access channel of the sideband; or

Setting the random access channel in the central sub-band, when the sideband randomly sets the random access channel, when the terminal initially enters the system, the random access channel is initiated by the central sub-band Random access, when the terminal is in a sideband, if the sideband sets the random access channel, initiate random access through the set random access channel, if the sideband is not set to the random The access channel switches to the subband of the set random access channel to initiate random access.

The method for setting a system channel according to claim 3, wherein the setting a channel in the central sub-band includes:

Setting a broadcast channel in the central subband, the central subband containing cell related system information and all subbands themselves Subband related system information.

13. A method of setting a system channel according to claim 12, wherein:

Setting a broadcast channel in the central subband, the central subband containing cell related system information and subband related system information of all subbands themselves or setting the broadcast channel in the central subband, randomly in the sideband Setting the broadcast channel, where the central sub-band includes cell-related system information and sub-band related system information of all sub-bands, when the terminal initially enters the system, acquires cell-related system information through the broadcast channel of the central sub-band And the sub-band related system information of the central sub-band, when the terminal is in the sideband, switching to the central sub-band to acquire the cell-related system information and the sub-band related system information of the sideband.

The method for setting a system channel according to claim 3, wherein the setting a channel in the central subband and the sideband includes:

Setting the broadcast channel in the central subband, and setting the broadcast channel in the sideband, the subband including cell related system information and subband related system information of the subband itself;

Setting the broadcast channel in the central sub-band, and setting the broadcast channel in the sideband, where the central sub-band includes cell-related system information and sub-band related system information of the central sub-band itself, The sideband contains its own subband related system information; or

The broadcast channel is set in the central subband, and the broadcast channel is randomly set in the sideband, the central subband containing cell related system information and subband related system information of all subbands themselves.

15. A method of setting a system channel according to claim 14, wherein:

Setting the broadcast channel in the central sub-band, and setting the broadcast channel in the sideband, where the sub-band includes cell-related system information and its own sub-band related system information, when the terminal initially enters the system, Through the broadcast channel cell related system information of the central subband and the subband related system information of the central subband, when the terminal is in the sideband, the cell related system information and the side of the sideband itself are acquired through the broadcast channel of the sideband With relevant system information; or

Setting the broadcast channel in the central sub-band, and setting the broadcast channel in the sideband, where the central sub-band includes cell-related system information and sub-band related system information of the central sub-band itself, When the sideband includes its own subband related system information, when the terminal initially enters the system, the broadcast channel cell related system information of the central subband and the subband related system information of the center subband, when the terminal is in the sideband, Switching to the central sub-band acquires the cell-related system information.

16. An apparatus for setting a system channel, the apparatus comprising:

a subband division module (1600), configured to perform subband division on a bandwidth, the subband includes a central subband and a sideband; a channel setting module (1700), configured to set a channel in the central subband, or in the The central subband and the sideband set a channel.

The device for setting a system channel according to claim 16, wherein the channel setting module (1700) sets a channel on the sideband to be specifically:

Setting the synchronization channel on the sidebands or randomly setting the synchronization channel; or

Setting the random access channel or randomly setting the random access channel in the sideband; or

The broadcast channel is set or randomly set in the sidebands.