CN101163122B - Method of transmitting TDD system control information - Google Patents
Method of transmitting TDD system control information Download PDFInfo
- Publication number
- CN101163122B CN101163122B CN200610140767XA CN200610140767A CN101163122B CN 101163122 B CN101163122 B CN 101163122B CN 200610140767X A CN200610140767X A CN 200610140767XA CN 200610140767 A CN200610140767 A CN 200610140767A CN 101163122 B CN101163122 B CN 101163122B
- Authority
- CN
- China
- Prior art keywords
- time
- time slot
- slot
- control signal
- control signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Mobile Radio Communication Systems (AREA)
- Time-Division Multiplex Systems (AREA)
Abstract
The invention discloses a time division duplex system, which is a method for controlling information transfer. The system is characterized in that control signals send information in the final OFDM symbol of the time slot 0. During the time slot intervals of the time slot 0 or all of the time, the system leads the final OFDM symbol of TSO to a cycle suffix. Additionally, the system requires the time used not for cycle suffix in the intervals to be constant independent from length change of cycle prefix. Through taking advantage of the method of sending signals provided by the invention, a mobile station can directly pick up control signals using synchronous signal timing, and avoids the detection of cycle prefix length. The method not only reduces delayed transaction, but also decreases imaginary complexity. At the same time, the control signals send information around the synchronous signals (the largest interval between control signals and synchronous signals is 9.38us). Compared with the common pilot, the synchronous signals have the advantages of higher energy and density and thus can provide much better channel estimation for the control signals to ensure a much better demodulation performance for the control signals.
Description
Technical field
The present invention relates to digital communicating field, particularly relate to the signaling method that comprises basic control information in the tdd systems based on orthogonal frequency division multiplexi.
Background technology
When switching, except the time and Frequency Synchronization of acquisition and Target cell, also should obtain some essential informations of Target cell when the initial connecting system of travelling carriage or in the minizone: as system bandwidth, antenna configurations.TDD (time division duplex) system for based on orthogonal frequency division multiplexi also comprises information such as circulating prefix-length.These information are extremely important for the travelling carriage that will carry out initial connecting system or switch in the minizone, compare with general control information, and these information all have higher requirement at reception time-delay, demodulation performance.
Therefore, how system sends the control signal that comprises these essential informations, make travelling carriage can obtain these information efficiently, to capacity, the link stability that improves system have great importance (control signal that claims for convenience of description, to comprise these essential informations below is a control signal).
Summary of the invention
Technical problem to be solved by this invention is to provide the signaling method that comprises basic control information in a kind of tdd systems based on orthogonal frequency division multiplexi, and this method has better demodulation performance, lower processing time-delay and implementation complexity than conventional method under identical condition.For realizing the object of the invention, control signal can adopt following pattern to send:
Pattern 1:
Control signal sends at last OFDM symbol of time slot 0, does not send any data in the time at the slot time of time slot 0.
Pattern 2:
Control signal sends at last OFDM symbol of time slot 0, last the OFDM symbol cyclic suffix in some or all of time of the slot time of time slot 0 as TS0.The time as cyclic suffix is not a constant that does not rely on the circulating prefix-length variation in the requirement slot time.
The signaling method that provides of the present invention is provided, and travelling carriage utilizes synchronizing signal regularly can directly extract control signal, has avoided the step of cyclic prefix length detection, has promptly reduced and has handled time-delay, has reduced the complexity of justing think again.Simultaneously, (largest interval of control signal and synchronizing signal is control signal: 9.38us) in the position transmission near synchronizing signal, compare with public guide frequency, synchronizing signal has higher energy and density, thereby can provide better channel estimating, and then guarantee that control signal has better demodulation performance for control signal.
Description of drawings
Accompanying drawing 1 has provided structure of time slot schematic diagram in the TDD system.
Accompanying drawing 2 has provided the sending method schematic diagram of an existing control signal.
Accompanying drawing 3 has provided one and has comprised control signal transmission schematic diagram of the present invention.
Accompanying drawing 4 has provided another one and has comprised control signal transmission schematic diagram of the present invention.
Embodiment
For ease of profound understanding the present invention, be example with the structure of time slot shown in the accompanying drawing 1 below, provide some and comprise embodiments of the invention.
Accompanying drawing 2 has provided the sending method schematic diagram of an existing control signal.In this schematic diagram, tiltedly the rectangle frame of underscore is represented the Cyclic Prefix of OFDM symbol, and horizontal line rectangle frame is represented frequency pilot sign, and the grid line rectangle frame is represented control signal, perpendicular line rectangle frame is represented slot time, and the chain-dotted line rectangle frame is represented the synchronizing signal in the DwPTS time slot.In this schematic diagram, frequency pilot sign sends at first ofdm signal of time slot 0, and control signal sends at second ofdm signal of time slot 0, and synchronizing signal sends in the DwPTS time slot.The send mode of this control signal has following shortcoming: 1. move you after obtaining the synchronizing signal timing, can't directly extract control signal.OFDM symbol among the TS0 (comprising the OFDM symbol that transmits control signal) can adopt long loop prefix, also can adopt short Cyclic Prefix, and like this, the timing of control signal and synchronizing signal is variable; 2. in order to save overhead, the density of the common pilot signal in the time slot and energy only satisfy the channel estimating of general signal usually.Require higher control signal for demodulation performance, under abominable channel, only depend on common pilot signal can't satisfy the channel estimating requirement of control signal.
Accompanying drawing 3 has provided one and has comprised control signal transmission schematic diagram (sending mode 1) of the present invention.In this schematic diagram, the slot time of time slot 0 is a constant that does not rely on the circulating prefix-length variation, and at this moment, control signal sends at last ofdm signal of time slot 0, and does not send any data in the time at the TI of TS0.Utilize above-mentioned control signal sending method, travelling carriage utilizes synchronizing signal regularly can directly extract control signal, has avoided the step of cyclic prefix length detection, has promptly reduced and has handled time-delay, has reduced the complexity of justing think again.Simultaneously, (largest interval of control signal and synchronizing signal is the slot time of time slot 0 to control signal in the position transmission near synchronizing signal, be no more than 9.38us), compare with public guide frequency, synchronizing signal has higher energy and density, thereby can provide better channel estimating, and then guarantee that control signal has better demodulation performance for control signal.
Accompanying drawing 4 has provided one and has comprised control signal transmission schematic diagram (sending mode 2) of the present invention.In this schematic diagram, the slot time of time slot 0 is one and relies on the numerical value that circulating prefix-length changes, at this moment, control signal except at signal last OFDM symbol of time slot 0 sends, cyclic suffix data of last OFDM symbol of sending time slots 0 in the some or all of time of the slot time in time slot 0 also.The time as cyclic suffix is not a constant (such as being 0) that does not rely on the circulating prefix-length variation in the requirement slot time.Compare with accompanying drawing 3, in the sending method that accompanying drawing 4 provides, the interval of control signal and synchronizing signal littler (equaling not to be used as in the slot time time of cyclic suffix at interval), the channel variation of the more real reflection control signal of the channel estimating that synchronizing signal provides.And because the cause of cyclic suffix, the ability that control signal resists the selectivity of channel frequency decline is stronger, thereby the sending method that accompanying drawing 4 provides can provide more performance.
It may be noted that 4, the slot time that the send mode that accompanying drawing 4 provides also can be applied to time slot 0 is a situation that does not rely on the constant that circulating prefix-length changes.
Certainly, also can be applied to the slot time of time slot 0 be a situation that relies on the numerical value that circulating prefix-length changes to the send mode that provides of accompanying drawing 3.Just performance can decrease.
Those skilled in the art that should be understood that the above only is preferred embodiment of the present invention, are not to be used for limiting practical range of the present invention; Everyly do equivalence according to the present invention and change and revise, all contained by claim of the present invention.
Claims (2)
1. the sending method of a TDD system control information is characterized in that,
Control signal adopts following pattern to send: control signal sends at last OFDM symbol of time slot 0, does not send any data in the time at the slot time of time slot 0;
Synchronizing signal sends at the descending pilot frequency time slot DwPTS of described time slot 0 back.
2. the sending method of a TDD system control information is characterized in that,
Control signal adopts following pattern to send: control signal sends at last OFDM symbol of time slot 0, last OFDM symbol cyclic suffix in some or all of time of the slot time of time slot 0 as time slot 0, requiring in the slot time time as cyclic suffix is not rely on the constant that circulating prefix-length changes;
Synchronizing signal sends at the descending pilot frequency time slot DwPTS of described time slot 0 back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610140767XA CN101163122B (en) | 2006-10-09 | 2006-10-09 | Method of transmitting TDD system control information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610140767XA CN101163122B (en) | 2006-10-09 | 2006-10-09 | Method of transmitting TDD system control information |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101163122A CN101163122A (en) | 2008-04-16 |
| CN101163122B true CN101163122B (en) | 2011-08-10 |
Family
ID=39297950
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200610140767XA Expired - Fee Related CN101163122B (en) | 2006-10-09 | 2006-10-09 | Method of transmitting TDD system control information |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101163122B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1164733A1 (en) * | 2000-01-24 | 2001-12-19 | NTT DoCoMo, Inc. | Channel constructing method and base station using the method |
| CN1464654A (en) * | 2002-06-12 | 2003-12-31 | 电子科技大学 | Method for controlling bit after frame end insertion in OFDM communication system |
-
2006
- 2006-10-09 CN CN200610140767XA patent/CN101163122B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1164733A1 (en) * | 2000-01-24 | 2001-12-19 | NTT DoCoMo, Inc. | Channel constructing method and base station using the method |
| CN1464654A (en) * | 2002-06-12 | 2003-12-31 | 电子科技大学 | Method for controlling bit after frame end insertion in OFDM communication system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101163122A (en) | 2008-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100502282C (en) | Transmission method of synchronization signal of time-division duplex system | |
| CN100534027C (en) | Transmission method of time division duplexing system | |
| CN101400157B (en) | Communication method and apparatus | |
| US8837397B2 (en) | Apparatus and method for co-existence between different radio access technologies | |
| CN101425845A (en) | Transmission method and apparatus for time division duplexing system | |
| CN105338612B (en) | Synchronization and control method and device of wireless repeater and wireless repeater | |
| CN100576773C (en) | The repeater obtains the method for transfer point in a kind of TD-SCDMA system | |
| CN101222272A (en) | Signal transmission method of physical descending control channel in descending pilot frequency time slot | |
| CN101159488B (en) | Physical broadcasting channel transmitting method of TDD system | |
| CN101841906B (en) | Method and base station for transmitting frames synchronously | |
| CN101753202A (en) | Up synchronous method and terminal. | |
| CN101415226A (en) | Method and apparatus for improving down pilot time slot resource utilization ratio of TDD system | |
| CN100518020C (en) | Method for transmitting control information of OFDM system | |
| CN101374011B (en) | Method for implementing critical frequency coexist between two different communication systems and physical layer frame structure | |
| CN101299873A (en) | Method for allocating random access channel | |
| CN102573045A (en) | Method, base station and system for synchronization of LTE-TDD (Long Term Evolution-Time Division Duplex) network and WiMAX (Worldwide Interoperability for Microwave Access) network | |
| CN102238721A (en) | Terminal synchronous timing control method and device | |
| CN102547967B (en) | Method, system and user device to realize synchronization through time division duplex long-term evolution system | |
| CN113301640A (en) | TDD synchronizer for 4G/5G | |
| CN101163122B (en) | Method of transmitting TDD system control information | |
| CN101159484B (en) | TDD system signal transmitting method and frame structure | |
| CN101114874B (en) | Synchronous signal transmitting method of TDD system | |
| CN101114877B (en) | Enhanced synchronous channel transmitting method | |
| CN107800522B (en) | Method and device in wireless communication | |
| CN101175058B (en) | Synchronous channel transmission method of TDD system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110810 Termination date: 20151009 |
|
| EXPY | Termination of patent right or utility model |