MULTI-MODE BASE STATION AND METHOD FOR SENDING/RECEIVING SIGNAL THEREOF

• US 20090221319A1
• Filed: 05/15/2009
• Published: 09/03/2009
• Est. Priority Date: 11/15/2006
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Yuan, Xuewen, LAN, Peng, Xia, Yingjiu
• Granted Patent: US 8,195,239 B2
• Time in Patent Office: Days
• US Class Current: 455/550.100
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points

Abstract

A multi-mode base station and a method for sending/receiving signals thereof are provided. In the base station, each base-band single-board is connected to a corresponding radio frequency (RF) unit through a multi-mode exchange bus, and the base-band single-boards of different modes are intermixed by using the compatibility of the exchange bus with in-phase/quadrature (IQ) data of various modes. Synchronization information, such as frame numbers required by various modes, forms a synchronization burst through multiplexed framing. Meanwhile, by using the same system clock, the synchronization burst and system clock are transmitted to the base-band single-boards of various modes through a set of synchronization clock buses. The main control and transmission functions are uniformly provided for each base-band single-board in the base station by a shared common module. The filling and synchronization of wireless IQ data of various modes are realized according to common-multiple relation mapping.

Claims

1. A multi-mode base station comprising at least one radio frequency (RF) unit, and further comprising:

at least two base-band single-boards of at least two modes; and

an exchange bus, configured to connect base-band single-boards to corresponding RF units in a manner compatible with each of the modes.

2. The multi-mode base station according to claim 1, further comprising:

a common module configured to at least provide main control, transmission, or a clock for the base-band single-boards, wherein;

the common module and the base-band single-boards are connected in a direct or indirect manner; and

the base-band single-boards at least adopt one of the main control, the transmission, or the clock provided by the common module.

3. The multi-mode base station according to claim 2, wherein the common module is configured to further provide the clock for the base-band single-boards through a clock bus.

4. The multi-mode base station according to claim 3, wherein the common module comprises:

a synchronization burst generation module configured to generate a synchronization burst of a mode according to a system clock, and the synchronization burst is output to the base-band single-boards through the clock bus.

5. The multi-mode base station according to claim 4, wherein the synchronization burst generation module comprises:

a first frequency divider configured to perform frequency division on the system clock to obtain a period signal of the synchronization burst and output the period signal;

a multi-frame generation module configured to generate a multi-frame carrying synchronization information about a required mode according to the period signal and output the multi-frame; and

a multiplexed framing module configured to perform multiplexed framing on the multi-frame output by the multi-frame generation module according to the system clock and the period signal, generate a synchronization burst carrying synchronization information about a mode supported by the base station, and output the synchronization burst to the base-band single-boards through the clock bus.

6. The multi-mode base station according to claim 5, wherein the multi-frame generation module comprises:

a second frequency divider configured to perform frequency division according to the period signal of the synchronization burst to obtain a multi-frame period signal;

a mode validity determination module configured to determine whether a mode is valid or not according to the multi-frame period signal and the period signal of the synchronization burst;

a counter configured to generate a frame number by counting the multi-frame period signals;

a cyclic redundancy check (CRC) module configured to perform CRC on a pre-configured mode type, a determination result output by the mode validity determination module, and a frame number output by the counter; and

a framing module configured to arrange the pre-configured mode type, the determination result output by the mode validity determination module, the frame number output by the counter, and the check value output by the CRC module, form a multi-frame, and output the multi-frame to the multiplexed framing module.

7. The multi-mode base station according to claim 5, wherein the synchronization burst generation module further comprises:

a time information frame module configured to generate a time information frame carrying global positioning system (GPS) time information according to the period signal and a GPS time, and output the time information frame to the multiplexed framing module;

wherein the multiplexed framing module is configured to perform multiplexed framing on the multi-frame output by the multi-frame generation module and the time information frame output by the time information frame module.

8. The multi-mode base station according to claim 2, wherein the common module and the base-band single-boards are connected in at least one of the following manners:

a chain-type interconnection, wherein the common module is at one end of a chain, and the base-band single-boards are serially-connected on the chain;

a star-type interconnection, wherein the common module is at a central position, and is connected to each of the base-band single-boards;

a bus-type interconnection, wherein the common module and each of the base-band single-boards are connected to a same bus respectively;

a ring-type interconnection, wherein the common module and each of the base-band single-boards are serially-connected on a same ring respectively; and

an exchange-type interconnection, wherein the common module and each of the base-band single-boards are connected to a same exchange respectively.

9. The multi-mode base station according to claim 1, wherein the mode of a base-band single-board comprises any one of the following modes:

a global system for mobile communication (GSM) mode, a code division multiple access (CDMA) mode, a worldwide interoperability for microwave access (WiMAX) mode, a wideband code division multiple access (WCDMA) mode, a time division synchronous code division multiple access (TD-SCDMA) mode, a code division multiple access 2000 (CDMA2000) mode, a personal handyphone system (PHS) mode, a cluster mode, a long term evolution (LTE) mode, and an air-interface evolution mode.

10. The multi-mode base station according to claim 1, wherein the exchange bus is compatible with each of the multi modes in the following manner:

the exchange bus carries in-phase/quadrature (IQ) data by using a basic frame group as a unit, each basic frame group comprises N basic frames, and a period of each basic frame group is M times as long as a service data mode period; and

a radio equipment fills the IQ data of M service data mode periods in one basic frame group for transmission,

wherein N and M are natural numbers.

11. The multi-mode base station according to claim 10, wherein the IQ data of the M service data mode periods is filled in one basic frame group for transmission according to the following rule:

each RF unit is assigned with a K-bit bearing space in a load region of every basic frame in the one basic frame group so that K=[M×

2×

D×

S×

A×

C×

F/N], wherein A is a number of antennae in the RF unit, C is a number of carriers in the RF unit, S is an over-sampling multiple of interface IQ data, D is a bit width of the I/Q data, F is a number of sectors supported by the RF unit, and “

[ ]”

indicates a round up operation.

12. The multi-mode base station according to claim 10, wherein the IQ data of the M service data mode periods is filled in one basic frame group for transmission according to the following rule:

when the bearing space assigned in the one basic frame group is greater than a bearing space actually required by the service frame IQ data, a bearing space in a basic frame with a posterior transmission sequence in the one basic frame group is filled preferentially, so that all bearing spaces of basic frames in the one basic frame group at a posterior part of the transmission sequence are filled, and an equal amount of data is filled in a remainder of the basic frames in the one basic frame group.

13. The multi-mode base station according to claim 10, wherein the IQ data of the M service data mode periods is filled in one basic frame group for transmission according to the following rule:

when the bearing space assigned in the one basic frame group is greater than the bearing space actually required by the service frame IQ data, a bearing space in a basic frame with a posterior transmission sequence in the one basic frame group is filled preferentially, so that all bearing spaces of basic frames in the one basic frame group at a posterior part of the transmission sequence are filled, bearing spaces of the basic frames in a related part of the transmission sequence in the basic frame group are not filled, and a one or a zero basic frame in a middle part of the one basic frame group is partially filled with data.

14. The multi-mode base station according to claim 10, wherein the IQ data of the M service data mode periods is filled in one basic frame group for transmission according to the following rule:

when the bearing space assigned in the one basic frame group is greater than the bearing space actually required by the service frame IQ data, a bearing space in a basic frame of a prior transmission sequence in the one basic frame group is filled preferentially, so that all bearing spaces of the basic frames of the prior transmission sequence are filled, and an equal amount of data is filled in a remainder of the basic frames in the one basic frame group.

15. The multi-mode base station according to claim 10, wherein the IQ data of the M service data mode periods is filled in one basic frame group for transmission according to the following rule:

when the bearing space assigned in the one basic frame group is greater than the bearing space actually required by the service frame IQ data, a bearing space in a basic frame of a prior transmission sequence in the one basic frame group is filled preferentially, so that all bearing spaces of the basic frames of the prior transmission sequence are filled, bearing spaces of the basic frames of the posterior part of the transmission sequence in the one basic frame group are not filled, and a one or a zero basic frame in a middle of the one basic frame group is partially filled with data.

16. The multi-mode base station according to claim 1, wherein a base-band single-board is inserted in a random slot.

17. A method for sending signals of a multi-mode base station, comprising:

performing, by base-band single-boards of different modes, base-band processing on downstream data to generate in-phase/quadrature (IQ) data, and outputting the IQ data to an exchange bus;

transmitting, by the exchange bus, the IQ data from base-band single-boards to a corresponding radio frequency (RF) unit in a manner compatible with each of a plurality of multi modes for RF processing; and

sending, by the RF unit, the data downwards after RF processing.

18. The method according to claim 17, wherein the base-band single-boards directly or indirectly obtains main control, transmission, or a clock from a shared common module;

and

the base-band single-boards at least adopt one of the obtained main control, transmission, and clock to process a base-band signal.

19. A method for receiving signals of a multi-mode base station, comprising:

performing, by a radio frequency (RF) processing unit, RF processing on upstream signals to generate IQ data of different modes, and outputting the IQ data to an exchange bus;

transmitting, by the exchange bus, the IQ data from the RF processing unit to a corresponding base-band single-board in a manner compatible with each of the different modes; and

performing, by the corresponding base-band single-board, base-band processing on the IQ data.

20. The method according to claim 19, further comprising:

directly or indirectly obtaining, by the corresponding base-band single-board, main control, transmission, or a clock from a shared common module, and processing base-band signals with at least one of the obtained main control, transmission, and clock.