Header structure for TDD systems

• US 6,567,383 B1
• Filed: 02/16/1999
• Issued: 05/20/2003
• Est. Priority Date: 02/18/1998
• Status: Expired due to Term

• Current Assignee: Sony Limited (Sony Group Corp.)
• Original Assignee: Sony Limited (Sony Group Corp.)
• Inventors: Böhnke, Ralf
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): HYUN, SOON D
• Application Number:
  US09/250,836
• Time in Patent Office: 1,554 Days
• Field of Search: 370/280, 370/294, 370/276, 370/277, 370/336, 370/458, 370/485, 370/498, 370/279, 370/337, 370/347, 370/474, 370/475, 370/478
• US Class Current: 370/280
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 27/26132 using repetition
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/1484 operating bytewise

Abstract

The present invention relates to a header structure for a TDD system which uses preferably an OFDM transmission system. Thereby a header slot according to the present invention fits entirely into one time slot of the GSM TDD structure. The header slot HS comprises a downlink channel DC and an uplink channel UC. The downlink channel DC comprises a synchronization channel SYNCH, a general broadcast channel GBCCH as well as an optional broadcast channel OBCCH. The uplink channel comprises a random access channel RACH. Both the synchronization channel SYNCH and the general broadcast channel GBCCH can comprise two identical repeated symbols S1, S2. The repetition of the identical symbols S1, S2 provides for a very efficient (secure) data transmission and a high-efficient correlation in view of a frequency and time synchronization due to the large number of samples in the symbols of the synchronization channel SYNCH and the general broadcast channel GBCCH.

Claims

1. Wireless transmission method, comprising the step of:

transmitting data in frames according to a time divisional duplex (TDD) system,

wherein frame comprises a header slot (HS) and a plurality of traffic slots (TS),

wherein the header slot (HS) and the individual traffic slots (TS) have the same time duration,

wherein the header slot (HS) occupies a single time slot, and

wherein the header slot (HS) is subdivided into;

a downlink channel (DC) for the transmission of synchronization data (SYNCH) and system data from a base station (1) to at least one mobile station (2, 3, 4), and

an uplink channel (UC) for the transmission of registration data (RACH) from at least one mobile station (3) to the base station (1).

2. Wireless transmission method according to claim 1, characterized in that the downlink channel (DC) and the uplink channel (UC) of the header slot (HS) have the same time duration.

3. Wireless transmission method according to claim 1, characterized in that the downlink channel (DC) of the header slot (HS) comprises a synchronization channel (SYNCH) and at least one broadcast channel (GBCCH, OBCCH) for the transmission of cell and/or system data to all or selected mobile stations (2, 3, 4).

12. Wireless transmission method according to claim 1, characterized in that the time duration of one time slot (HS, TS) is equal to the time duration of one time slot according to a GSM standard.

13. Wireless transmission method according to claim 1, whereby said wireless transmission method is used for indoor and low range outdoor wireless transmissions.

4. Wireless transmission method, comprising the step of:

transmitting data in frames according to a time divisional duplex (TDD) system,

wherein each frame comprises a header slot (HS) and a plurality of traffic slots (TS),

wherein the header slot (HS) and the individual traffic slots (TS) have the same time duration,

wherein the header slot (HS) occupies a single time slot,

wherein the header slot (HS) is subdivided into;

a downlink channel (DC) for the transmission of synchronization data (SYNCH) and system data from a base station (1) to at least one mobile station (2, 3, 4), and

an uplink channel (UC) for the transmission of registration data (RACH) from at least one mobile station (3) to the base station (1),

wherein the downlink channel (DC) of the header slot (HS) comprises a synchronization channel (SYNCH) and at least one broadcast channel (GBCCH, OBCCH) for the transmission of cell and/or system data to all or selected mobile stations (2, 3, 4), and

wherein the synchronization channel (SYNCH) of the header slot (HS) comprises at least two identical repeated symbols (S1,S2).

6. Wireless transmission method according to claim 4, characterized in that a repeated structure of the synchronization channel (SYNCH) and/or the broadcast channel (GBCCH, OBCCH) of the header slot (HS) is used for a frequency and/or time synchronization by means of a correlation technique (5, 6).

5. Wireless transmission method, comprising the step of:

transmitting data in frames according to a time divisional duplex (TDD) system,

wherein each frame comprises a header slot (HS) and a plurality of traffic slots (TS),

wherein the header slot (HS) and the individual traffic slots (TS) have the same time duration,

wherein the header slot (HS) occupies a single time slot,

wherein the header slot (HS) is subdivided into;

a downlink channel (DC) for the transmission of synchronization data (SYNCH) and system data from a base station (1) to at least one mobile station (2, 3, 4), and

an uplink channel (UC) for the transmission of registration data (RACH) from at least one mobile station (3) to the base station (1),

wherein the downlink channel (DC) of the header slot (HS) comprises a synchronization channel (SYNCH) and at least one broadcast channel (GBCCH, OBCCH) for the transmission of cell and/or system data to all or selected mobile stations (2, 3, 4), and

wherein the at least one broadcast channel (GBCCH, OBCCH) of the header slot (HS) comprises at least two identical repeated symbols.

7. Wireless transmission method, comprising the step of:

transmitting data in frames according to a time divisional duplex (TDD) system,

wherein each frame comprises a header slot (HS) and a plurality of traffic slots (TS),

wherein the header slot (HS) and the individual traffic slots (TS) have the same time duration,

wherein the header slot (HS) occupies a single time slot,

wherein the header slot (HS) is subdivided into;

a downlink channel (DC) for the transmission of synchronization data (SYNCH) and system data from a base station (1) to at least one mobile station (2, 3, 4), and

an uplink channel (UC) for the transmission of registration data (RACH) from at least one mobile station (3) to the base station (1),

wherein the downlink channel (DC) of the header slot (HS) comprises a synchronization channel (SYNCH) and at least one broadcast channel (GBCCH, OBCCH) for the transmission of cell and/or system data to all or selected mobile stations (2, 3, 4),

wherein a general broadcast channel (GBCCH) is transmitted in the header slot (HS) of every frame, and

wherein an optional broadcast channel (OBCCH) is only transmitted when the capacity of the general broadcast channel (GBCCH) is not sufficient or when specific data are to be transmitted.

8. Wireless transmission method according to claim 7, characterized in that, at least for transmission of the optional broadcast channel (OBCCH) of the header slot (HS), an OFDM system with a plurality of subcarriers (SC) is used.

10. Wireless transmission method according to claim 8, characterized in that the synchronization channel (SYNCH) is comprised of two identical repeated symbols (S1, S2) having respectively a time duration of 30 microseconds, and

wherein a basic subcarrier spacing of 4.167 kHz is used for the OFDM system and only every eighth subcarrier (SC) is modulated in the synchronization channel (SYNCH).

11. Wireless transmission method according to claim 8, characterized in that in the optional broadcast channel (OBCCH) of the header slot (HS) a subset of subcarriers (SC) is allocated to the transmission of data of a predetermined mobile station (2, 3, 4).

9. Wireless transmission method, comprising the step of:

transmitting data in frames according to a time divisional duplex (TDD) system,

wherein each frame comprises a header slot (HS) and a plurality of traffic slots (TS),

wherein the header slot (HS) and the individual traffic slots (TS) have the same time duration,

wherein the header slot (HS) occupies a single time slot, and

wherein the header slot (HS) is subdivided into;

a downlink channel (DC) for the transmission of synchronization data (SYNCH) and system data from a base station (1) to at least one mobile station (2, 3, 4), and

an uplink channel (UC) for the transmission of registration data (RACH) from at least one mobile station (3) to the base station (1),

wherein, at least for the transmission of the synchronization channel, (SYNCH) an OFDM system comprising a plurality of equally spaced subcarriers (SC) is used, and

wherein the time duration of a symbol (S1, S2) of the synchronization channel (SYNCH) is (1/n)×

(the subcarrier spacing of the OFDM system), n being an integer greater than 1, of the time duration of OFDM modulated symbols in a traffic channel (TC), and only every n-th subcarrier (SC) is modulated in the synchronization channel (SYNCH).

14. Wireless transmission system, comprising:

a base station (1); and

at least one mobile station (2, 3, 4),

wherein the base station (1) and the mobile station (2, 3, 4) transmit data in frames according to a time divisional duplex (TDD) system,

wherein each frame comprises a header slot (HS) and a plurality of traffic slots (TS),

wherein the header slot (HS) comprises one single time slot,

wherein the header slot (HS) and the individual traffic slots (TS) have the same time duration, and

wherein the header slot is subdivided into;

a downlink channel (DC) for the transmission of synchronization data (SYNCH) and system data from said base station (1) to said at least one mobile station (2, 3, 4), and

an uplink channel (UC) for the transmission of registration data (RACH) from said at least one mobile station (2, 3, 4) to the base station (1).

15. Wireless transmission system according to claim 14, characterized in that the downlink channel (DC) and the uplink channel (UC) of the header slot (HS) have the same time duration.

16. Wireless transmission system according to claim 14, characterized in that the downlink channel (DC) of the header slot (HS) comprises a synchronization channel (SYNCH) and at least one broadcast channel (GBCCH, OBCCH) for the transmission of cell and/or system data.

24. Wireless transmission system according to claim 15, characterized in that the time duration of one time slot is equal to the time duration of one time slot according to a GSM standard.

17. Wireless transmission system, comprising:

a base station (1); and

at least one mobile station (2, 3, 4),

wherein the base station (1) and the mobile station (2, 3, 4) transmit data in frames according to a time divisional duplex (TDD) system,

wherein each frame comprises a header slot (HS) and a plurality of traffic slots (TS),

wherein the header slot (HS) comprises one single time slot,

wherein the header slot (HS) and the individual traffic slots (TS) have the same time duration,

wherein the header slot is subdivided into;

a downlink channel (DC) for the transmission of synchronization data (SYNCH) and system data from said base station (1) to said at least one mobile station (2, 3, 4), and

an uplink channel (UC) for the transmission of registration data (RACH) from said at least one mobile station (2, 3, 4) to the base station (1),

wherein the downlink channel (DC) of the header slot (HS) comprises a synchronization channel (SYNCH) and at least one broadcast channel (GBCCH, OBCCH) for the transmission of cell and/or system data, and

wherein the synchronization channel (SYNCH) of the header slot (HS) comprises at least two identical repeated symbols (S1, S2).

19. Wireless transmission system according to claim 17, characterized in that the base station (1) and the mobile station (2, 3, 4) use a repeated structure of the synchronization channel (SYNCH) and/or the broadcast channel (GBCCH, OBCCH) for a frequency and/or time synchronization by means of a correlation detection means (5, 6).

18. Wireless transmission system, comprising:

a base station (I); and

at least one mobile station (2, 3, 4),

wherein the base station (1) and the mobile station (2, 3, 4) transmit data in frames according to a time divisional duplex (TDD) system,

wherein each frame comprises a header slot (HS) and a plurality of traffic slots (TS),

wherein the header slot (HS) comprises one single time slot,

wherein the header slot (HS) and the individual traffic slots (TS) have the same time duration,

wherein the header slot is subdivided into;

a downlink channel (DC) for the transmission of synchronization data (SYNCH) and system data from said base station (1) to said at least one mobile station (2, 3, 4), and

an uplink channel (UC) for the transmission of registration data (RACH) from said at least one mobile station (2, 3, 4) to the base station (1),

wherein the downlink channel (DC) of the header slot (HS) comprises a synchronization channel (SYNCH) and at least one broadcast channel (GBCCH, OBCCH) for the transmission of cell and/or system data, and

wherein the at least one broadcast channel (GBCCH, OBCCH) of the header slot (HS) comprises at least two identical repeated symbols.

20. Wireless transmission system, comprising:

a base station (1); and

at least one mobile station (2, 3, 4),

wherein the base station (1) and the mobile station (2, 3, 4) transmit data in frames according to a time divisional duplex (TDD) system,

wherein each frame comprises a header slot (HS) and a plurality of traffic slots (TS),

wherein the header slot (HS) comprises one single time slot,

wherein the header slot (HS) and the individual traffic slots (TS) have the same time duration,

wherein the header slot is subdivided into;

a downlink channel (DC) for the transmission of synchronization data (SYNCH) and system data from said base station (1) to said at least one mobile station (2, 3, 4), and

an uplink channel (UC) for the transmission of registration data (RACH) from said at least one mobile station (2, 3, 4) to the base station (1),

wherein the downlink channel (DC) of the header slot (HS) comprises a synchronization channel (SYNCH) and at least one broadcast channel (GBCCH, OBCCH) for the transmission of cell and/or system data,

wherein a general broadcast channel (GBCCH) is provided in the header slot (HS) of every time frame, and

wherein an optional broadcast channel (OBCCH) is only provided when the capacity of the general broadcast (GBCCH) is not sufficient or when specific data are to be transmitted.

21. Wireless transmission system, comprising:

abase station (1); and

at least one mobile station (2, 3, 4),

wherein the base station (1) and the mobile station (2, 3, 4) transmit data in frames according to a time divisional duplex (TDD) system,

wherein each frame comprises a header slot (HS) and a plurality of traffic slots (TS), p1 wherein the header slot (HS) comprises one single time slot,

wherein the header slot (HS) and the individual traffic slots (TS) have the same time duration,

wherein the header slot is subdivided into;

a downlink channel (DC) for the transmission of synchronization data (SYNCH) and system data from said base station (1) to said at least one mobile station (2, 3, 4), and

an uplink channel (UC) for the transmission of registration data (RACH) from said at least one mobile station (2, 3, 4) to the base station (1),

wherein the downlink channel (DC) and the uplink channel (UC) of the header slot (HS) have the same time duration, and

wherein, at least for the transmission of the downlink channel (DC) of the header slot (HS), an OFDM system comprising a plurality of equally spaced subcarriers (SC) is used.

22. Wireless transmission system according to claim 21, characterized in that the time duration of a symbol (S1, S2) of the synchronization channel (SYNCH) is (1/n)×

(the subcarrier spacing of the OFDM system), n being an integer greater than 1, of the time duration of OFDM modulated symbols in a traffic channel (TC), and only every n-th subcarrier (SC) is modulated in the synchronization channel (SYNCH).

23. Wireless transmission system according to claim 21, characterized in that the synchronization channel (SYNCH) is comprised of two identical repeated symbols (S1, S2) having respectively a time duration of 30 microseconds, wherein a basic subcarrier spacing of 4.167 kHz is used for the OFDM system and only every eighth subcarrier (SC) is modulated.