CN101163319B - Method and device of reading broadcast frame - Google Patents
Method and device of reading broadcast frame Download PDFInfo
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- CN101163319B CN101163319B CN2006101319607A CN200610131960A CN101163319B CN 101163319 B CN101163319 B CN 101163319B CN 2006101319607 A CN2006101319607 A CN 2006101319607A CN 200610131960 A CN200610131960 A CN 200610131960A CN 101163319 B CN101163319 B CN 101163319B
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Abstract
The invention belongs to the wireless access technical field, and provides a method and a device to read a broadcast frame. The method comprises the concrete steps as follows: the information which does not need the broadcast frame mode indication in an anchor broadcast frame is read at first; then the broadcast frame is read; whether the frequency spectrum information is contained is judged according to the read broadcast frame mode; if the spectrum information is contained, the spectrum information is read, the bandwidth of a cruise broadcast frame is ascertained according to the frequency spectrum information, and the system broadcast information indicated by the broadcast frame mode in the anchor broadcast frame and the cruise broadcast frame is read; otherwise, the system broadcast information indicated by the broadcast frame mode in the anchor broadcast frame is read. The invention is used to shorten the search time for the terminal to receive a system signal, and the broadcast frame structure used in the invention improves the utility rate of the frequency spectrum.
Description
Technical Field
The invention relates to the technical field of wireless access, in particular to a technology for reading a broadcast frame.
Background
With the rapid development of high-speed network technology and multimedia technology, wireless networks are evolving from circuit switching to packet switching, and various wireless broadband access technologies are appearing in succession, wherein in the super-third generation mobile communication system B3G/4G, the bandwidth variation range is wide, which can be from several MHz to hundreds of MHz, and can work under the condition of both low bandwidth and high bandwidth, which requires that the system design be compatible with the condition of multiple bandwidths, so that the system can work normally under the condition of low bandwidth, and the spectrum can be fully applied under the condition of high bandwidth. However, in the prior art, each physical channel is multiplexed in a frame structure in a relatively fixed manner, when the transmission bandwidth increases, the broadcasted data does not increase linearly therewith, the spectrum utilization rate decreases, and the time for the terminal to search when receiving the signal increases; when the transmission bandwidth is reduced, the spectrum resources are insufficient, and each physical channel cannot be carried.
The multiplexing is relatively fixed for each physical channel in the frame structure. For example, in CDMA2000 air interface evolution CDMA2000 AIE, a superframe consists of a preamble frame for transmitting synchronization codes, pilots, and system broadcast information, and a normal frame. A forward link physical broadcast channel 0 for transmitting basic system information, such as system version, number of antennas, etc., and positioned in a number 0 orthogonal frequency division multiplexing OFDM symbol, occupying fixed subcarriers; forward link physical broadcast channel 1, sending system forward information channel, and the terminal can receive the signaling of forward channel according to the information: the position is in OFDM symbol of 0 to 4 number of orthogonal frequency division multiplexing, occupy the fixed subcarrier; the common pilot channel of the front link is used for channel estimation, and the position of the common pilot channel is from 0 to 1 orthogonal frequency division multiplexing OFDM symbol, and fixed subcarriers are occupied; acquiring a channel by a forward link, sending a synchronous code, carrying out system synchronization by a terminal according to the synchronous code, and occupying all subcarriers by using a No. 5 to No. 6 Orthogonal Frequency Division Multiplexing (OFDM) symbol; and the forward link interferes with other cells, transmits synchronous codes and interference information of other cells, is positioned in a No. 7 orthogonal frequency division multiplexing OFDM symbol, and occupies all subcarriers.
Disclosure of Invention
The present invention provides a method for reading a broadcast frame and a communication system, which can improve the utilization rate of a frequency spectrum and shorten the search time of a terminal receiving signal when a transmission bandwidth changes.
In order to solve the technical problems, the invention aims to realize the following technical scheme:
one embodiment of the present invention provides a method of reading a broadcast frame, including:
a terminal reads a broadcast frame mode; the broadcast frames include an anchor broadcast frame and a cruising broadcast frame, the anchor broadcast frame is transmitted at a fixed frequency with a fixed frequency bandwidth, the cruising broadcast frame determines the frequency bandwidth and the transmitted information according to the planning and configuration condition of the system or the frequency spectrum sharing condition, and the broadcast frame mode is used for indicating the system broadcast information contained in the broadcasted anchor broadcast frame and the cruising broadcast frame;
if the broadcast frame indicated by the broadcast frame mode contains the frequency spectrum information, reading the frequency spectrum information firstly, and then reading the broadcast information except the frequency spectrum information in the broadcast frame, otherwise, directly reading the broadcast information indicated by the broadcast frame mode in the broadcast frame.
The present invention also provides a communication system comprising: a base station, a user terminal;
the base station is configured to send broadcast information to a ue through broadcast frames, where the broadcast frames include anchor broadcast frames and cruising broadcast frames, the anchor broadcast frames are transmitted at a fixed frequency with a fixed bandwidth, and the cruising broadcast frames determine the bandwidth and the transmitted information according to a planning and configuration condition of a system or a spectrum sharing condition;
the user terminal is configured to read the broadcast frame mode from a base station, where the broadcast frame mode is used to indicate system broadcast information included in an anchor broadcast frame and a cruising broadcast frame of a broadcast, and if the broadcast information indicated by the broadcast frame mode includes spectrum information, read the spectrum information first, and then read broadcast information in the broadcast frame except the spectrum information, otherwise, directly read the broadcast information indicated by the broadcast frame mode in the broadcast frame.
The invention reads the broadcast frame mode through the terminal, directly judges whether the frequency spectrum information is contained according to the indication of the broadcast frame mode, does not need to search again in the variation range of the bandwidth when the bandwidth is increased, and shortens the reading time of the terminal when receiving the system signal; the frame structure adopted in the reading process of the invention is that a superframe comprises a broadcast frame and a plurality of adjacent data frames, when the bandwidth is insufficient, the broadcast frame mode only indicates some necessary information, the rest broadcast information is placed in the adjacent data frames, and when the bandwidth is increased, various types of system broadcast information are organized in the broadcast frame, thereby improving the utilization rate of the frequency spectrum.
Drawings
FIG. 1 is a frame structure diagram of a broadcast frame of the present invention;
FIG. 2 is a flowchart of a first embodiment of the present invention;
FIG. 3 is a flowchart of a second embodiment of the present invention;
FIG. 4 is a diagram of the apparatus of the present invention.
In particular toDetailed description of the preferred embodiments
The present invention provides a method for reading a broadcast frame, and in order to make the objects, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1, a frame structure diagram of a broadcast frame according to the present invention, each super-frame is composed of a broadcast frame and a plurality of adjacent data frames, the broadcast frame is divided into an anchor broadcast frame and a cruising broadcast frame in frequency, the anchor broadcast frame is transmitted in a fixed frequency band width, and the cruising broadcast frame determines the frequency band width and the transmission information according to the planning and configuration of the system or the spectrum sharing.
The anchor broadcast frame contains broadcast frame pattern and spectral information. The broadcast frame mode is used to indicate the mode of the broadcast frame, i.e. which system broadcast information to be transmitted is contained in the broadcast anchor broadcast frame and the cruise broadcast frame, and various types of system broadcast information are organized in the broadcast frame by the indication of the broadcast frame mode. When the bandwidth is insufficient, only some important necessary information is indicated, such as the downlink channel parameters, and the rest system broadcast information is placed in the adjacent data frames; when the bandwidth is increased, according to the size of the bandwidth, some other system broadcast information is indicated, such as uplink channel parameters, cell and neighbor cell parameters, broadcast multicast service control parameters, broadcast multicast service data, and the like. The spectrum information is used to indicate the bandwidth of the cruising broadcast frame and the bandwidths of the uplink and the downlink of other frames.
The anchor broadcast frame may also include, among other things, system basic information and paging. Basic information of the system includes a system version, an antenna configuration, and the like.
When the system broadcast information is not placed in one superframe, the system broadcast information can be placed in an adjacent superframe.
For the frame structure of the broadcast frame, the following example is described in detail:
for example, each superframe is composed of a broadcast frame and a plurality of adjacent data frames, the superframe length is 10ms, the bandwidth of the anchor broadcast frame is 1.25MHz, and the broadcast control channel BCCH in the broadcast frame includes the system broadcast message BCCHr of the relay station, the system basic information BCCH1, BCCH2, the spectrum information BCCH3, other system broadcast information BCCHo, and the synchronization channel SYNC.
Broadcast control channel BCCH, is used for bearing the weight of the system broadcast message;
the BCCH of the relay station occupies one OFDM symbol, the BCCH of the relay station increases along with the increase of the bandwidth, and the information broadcasted by the relay station may change for each superframe, so that the cycle of the BCCHr is a superframe;
the basic information BCCH1 of the system, such as system version, antenna configuration, etc., contains less data, and the system will change only when it is reconfigured, so the change is very slow, considering the delay of receiving, the performance of receiving and the data size of BCCH1 itself, 32 superframes are adopted as the period, and one OFDM symbol in the anchor broadcast frame is occupied in one period, and repetition coding or other coding methods can be adopted;
BCCH2 containing broadcast frame pattern, downlink parameters, paging messages, each superframe containing BCCH2, each BCCH2 containing broadcast frame pattern, control fields in BCCH2 indicating whether downlink parameters and paging messages are contained, the broadcast frame pattern being identified by 5 bits, each bit indicating whether BCCH3, BCCH4, BCCH5, BCCH6, BCCH7 are contained;
spectrum information BCCH3 indicating the uplink and downlink bandwidths of the entire system, so that the bandwidth of the cruising broadcast frame, i.e. the downlink bandwidth minus the anchor broadcast frame, can be known, the period of BCCH3 is 128 superframes, which appears once every 128 superframes, due to the delay of the terminal, the receiving performance and the data size of BCCH3 itself and the consistency among different bandwidths;
BCCHo, other system broadcast information, i.e. information including BCCH2 that has not been transmitted in the anchor broadcast frame, uplink channel parameter BCCH4, cell and neighbor cell parameter BCCH5, broadcast multicast service control parameter BCCH6, BCCH7 containing broadcast multicast service data;
the SYNC channel SYNC, the terminal is used to establish downlink synchronization, and the period is a superframe.
Referring to fig. 2, which is a flow chart of the first embodiment of the present invention, the implementation of the present invention includes the following steps:
step 201: reading a broadcast frame mode, wherein the broadcast frame mode indicates which broadcast information is contained in the broadcast information, such as frequency spectrum information, downlink channel parameters, uplink channel parameters, cell and adjacent cell parameters, broadcast multicast service control parameters, broadcast multicast service data and the like;
step 202: judging whether the broadcast information contains frequency spectrum information according to the read broadcast information indicated by the broadcast frame mode, if so, executing step 204, otherwise, executing step 203;
step 203: reading the broadcast information indicated by the broadcast frame mode in the anchor broadcast frame, and then executing step 206;
step 204: reading frequency spectrum information, and determining the bandwidth of a cruising broadcast frame and the uplink and downlink bandwidths of other frames according to the frequency spectrum information;
step 205: reading system broadcast information except for spectrum information indicated by a broadcast frame mode in an anchor broadcast frame and a cruising broadcast frame;
to this end, the reading of the broadcast frame in a super frame is completed, and if a super frame does not hold the system broadcast information, the following steps should be included after step 203 or step 205:
step 206: and judging whether the broadcast information of all the broadcast frames is read, if so, ending the process, otherwise, executing the step 201.
Referring to fig. 3, a flowchart of a second embodiment of the present invention specifically includes:
step 301: reading information which does not need a broadcast frame mode indication in an anchor broadcast frame, such as system basic information and paging;
step 302: reading a broadcast frame mode, wherein the broadcast frame mode indicates which broadcast information is contained in the broadcast information, such as frequency spectrum information, downlink channel parameters, uplink channel parameters, cell and adjacent cell parameters, broadcast multicast service control parameters, broadcast multicast service data and the like;
step 303: judging whether the broadcast information comprises frequency spectrum information according to the read broadcast information indicated by the broadcast frame mode, if so, executing a step 305, otherwise, executing a step 304;
step 304: reading the broadcast information indicated by the broadcast frame mode in the anchor broadcast frame, and then executing step 307;
step 305: reading frequency spectrum information, and determining the bandwidth of a cruising broadcast frame and the uplink and downlink bandwidths of other frames according to the frequency spectrum information;
step 306: reading system broadcast information except for spectrum information indicated by a broadcast frame mode in an anchor broadcast frame and a cruising broadcast frame;
to this end, the reading of the broadcast frame in a super frame is completed, and if a super frame does not hold the system broadcast information, the following steps should be included after step 304 or step 307:
step 307: and judging whether the broadcast information of all the broadcast frames is read, if so, ending the process, otherwise, executing the step 301.
Referring to fig. 4, which is a diagram of the apparatus of the present invention, the following is described in detail:
a base station 401 for transmitting broadcast information to a user terminal 402 through a broadcast frame;
the user terminal 402 is configured to read the broadcast frame mode from the base station 401, determine whether spectrum information is included according to the indication of the broadcast frame mode, read the spectrum information if the spectrum information is included, and then read the broadcast information indicated by the broadcast frame mode in the broadcast frame, otherwise, directly read the broadcast information indicated by the broadcast frame mode in the broadcast frame.
Wherein the ue 402 is further configured to read the broadcast information in the broadcast frame without the indication of the broadcast frame mode.
Wherein, the user terminal 402 is further configured to obtain a bandwidth of a broadcast frame according to the read spectrum information.
When the bandwidth is insufficient, only some necessary information is indicated, the rest information is placed in a data frame adjacent to a broadcast frame, and the necessary system information indicated by the broadcast frame mode is read; or,
when the bandwidth is increased, various types of system broadcast information are organized in a broadcast frame, and various types of broadcast information indicated by the broadcast frame mode are read.
The broadcast frame is divided into an anchor broadcast frame and a cruising broadcast frame in frequency, the anchor broadcast frame is transmitted in a fixed frequency band width, and the frequency band width and the transmitted information are determined according to the planning and configuration condition of the system or the spectrum sharing condition of the cruising broadcast frame.
The broadcast frame mode is a mode indicating a broadcast frame, that is, indicating which system broadcast information to be transmitted is included in an anchor broadcast frame and a cruising broadcast frame of a broadcast.
The method and the apparatus for reading a broadcast frame provided by the present invention are described in detail above, and a specific example is applied in the present disclosure to explain the principle and the implementation of the present invention, and the description of the above embodiment is only used to help understand the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A method of reading a broadcast frame, comprising:
a terminal reads a broadcast frame mode; the broadcast frames include an anchor broadcast frame and a cruising broadcast frame, the anchor broadcast frame is transmitted at a fixed frequency with a fixed frequency bandwidth, the cruising broadcast frame determines the frequency bandwidth and the transmitted information according to the planning and configuration condition of the system or the frequency spectrum sharing condition, and the broadcast frame mode is used for indicating the system broadcast information contained in the broadcasted anchor broadcast frame and the cruising broadcast frame;
if the broadcast frame indicated by the broadcast frame mode contains the frequency spectrum information, reading the frequency spectrum information firstly, and then reading the broadcast information except the frequency spectrum information in the broadcast frame, otherwise, directly reading the broadcast information indicated by the broadcast frame mode in the broadcast frame.
2. The method of claim 1, wherein reading the broadcast frame pattern is preceded by:
and the terminal reads the information which does not need the broadcast frame mode indication in the broadcast frame.
3. The method of claim 2, wherein the terminal reading the spectrum information further comprises:
and the terminal acquires the bandwidth of the broadcast frame according to the read frequency spectrum information.
4. The method of claim 3, wherein reading the broadcast information indicated by the broadcast frame mode in the broadcast frame comprises:
when the bandwidth is insufficient, the broadcast frame mode indicates the necessary information of the system, the necessary information comprises a downlink channel parameter, the rest information is placed in a data frame adjacent to the broadcast frame, and the necessary information of the system indicated by the broadcast frame mode is read;
when the bandwidth is increased, the broadcast frame mode organizes system broadcast information in a broadcast frame, and reads the broadcast information indicated by the broadcast frame mode.
5. The method of claim 1, wherein reading the broadcast information indicated by the broadcast frame mode in the broadcast frame further comprises:
and judging whether the broadcast information of all the broadcast frames is read or not, if so, ending the reading process, and otherwise, reading the broadcast frame mode of the next broadcast frame.
6. A communication system, comprising: a base station, a user terminal;
the base station is configured to send broadcast information to a ue through broadcast frames, where the broadcast frames include anchor broadcast frames and cruising broadcast frames, the anchor broadcast frames are transmitted at a fixed frequency with a fixed bandwidth, and the cruising broadcast frames determine the bandwidth and the transmitted information according to a planning and configuration condition of a system or a spectrum sharing condition;
the user terminal is configured to read the broadcast frame mode from a base station, where the broadcast frame mode is used to indicate system broadcast information included in an anchor broadcast frame and a cruising broadcast frame of a broadcast, and if the broadcast information indicated by the broadcast frame mode includes spectrum information, read the spectrum information first, and then read broadcast information in the broadcast frame except the spectrum information, otherwise, directly read the broadcast information indicated by the broadcast frame mode in the broadcast frame.
7. The system of claim 6, wherein the user terminal is further configured to read broadcast information in a broadcast frame that does not require a broadcast frame mode indication.
8. The system of claim 7, wherein the user terminal is further configured to obtain a bandwidth of a broadcast frame according to the read spectrum information.
9. The system of claim 8, wherein the user terminal is further configured to:
when the bandwidth is insufficient, only indicating the necessary information of the system, wherein the necessary information comprises the parameters of a downlink channel, and the rest information is put in a data frame adjacent to a broadcast frame to read the necessary information of the system indicated by the broadcast frame mode; or,
when the bandwidth is increased, organizing system broadcast information in a broadcast frame, and reading the broadcast information indicated by the broadcast frame mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101319607A CN101163319B (en) | 2006-10-13 | 2006-10-13 | Method and device of reading broadcast frame |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101319607A CN101163319B (en) | 2006-10-13 | 2006-10-13 | Method and device of reading broadcast frame |
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| CN101163319A CN101163319A (en) | 2008-04-16 |
| CN101163319B true CN101163319B (en) | 2010-09-22 |
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| CN2006101319607A Expired - Fee Related CN101163319B (en) | 2006-10-13 | 2006-10-13 | Method and device of reading broadcast frame |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101640930B (en) * | 2008-08-01 | 2012-06-06 | 中兴通讯股份有限公司 | Method and device for realizing large bandwidth backward compatibility |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1235437A (en) * | 1998-03-19 | 1999-11-17 | 株式会社日立制作所 | broadcast information delivery system |
| CN1474580A (en) * | 2002-08-07 | 2004-02-11 | 华为技术有限公司 | Selection of relevant marker based on broadcast mode and small zone switching method |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1235437A (en) * | 1998-03-19 | 1999-11-17 | 株式会社日立制作所 | broadcast information delivery system |
| CN1474580A (en) * | 2002-08-07 | 2004-02-11 | 华为技术有限公司 | Selection of relevant marker based on broadcast mode and small zone switching method |
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| CN101163319A (en) | 2008-04-16 |
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