Transmission Method and Apparatus for Uplink Control Signaling in Time Division OFDMA System

• US 20100177669A1
• Filed: 03/21/2008
• Published: 07/15/2010
• Est. Priority Date: 03/21/2007
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Original Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.)
• Inventors: Xiao, Guojun, Suo, Shiqiang, Zhang, Ruiqi
• Granted Patent: US 8,213,345 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04L 1/0027 Scheduling of signalling, e.g. occurrence thereof
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

A method and an apparatus for an uplink control signaling transmission in a time division duplex OFDMA system are provided for the long term evolution time division duplex (LTE TDD). A signaling processing unit reserves frequency resource for an uplink control channel according to the total amount of the uplink control signaling, and the reserved frequency resource are assigned on both sides of the frequency domain used by uplink time slots, so that the uplink control signaling of a terminal UE is transmitted on the position and the bandwidth of the reserved frequency resource. The transmitted uplink control signaling is transmitted on respective reserved uplink control sub-channels by an intra-subframe hopping way, each terminal UE or a group of UEs corresponding to a frequency-hop sequence. The present invention is simple to realizes and capable of utilizing resource repeatedly and utilizing the time domain and frequency domain diversity simultaneously.

Claims

1. A method for uplink control signaling transmission in a TDD OFDMA system, which is used for individually transmitting non-data associated control signaling in a LTE TDD system, wherein the method comprises the following steps:

A. based on the total amount of the uplink control signaling and available uplink time slots, frequency resource being reserved for uplink control channel transmission, which is on both sides of the system bandwidth so as to form a reserved uplink control channel;

B. the uplink control signaling, which is transmitted on the reserved frequency resource for uplink control channel transmission, being transmitted by an intra-subframe frequency hopping way on the reserved uplink control channel, and a frequency-hop sequence corresponding to the signaling of each terminal UE or a group of UEs.

2. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 1, wherein, in the step A, forming the reserved uplink control channel includes:

A1. extracting uplink-to-downlink time slot ratio and system operating bandwidth, acquiring the total amount of the uplink control signaling need to be transmitted on the reserved frequency resource;

A2. determining the uplink time slots used to carry the reserved frequency resource of uplink control channel based on the uplink time slot resource;

A3. assigning the uplink control signaling on both sides of frequency resource of the used uplink time slots.

3. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 1, wherein, in the step B, transmitting on the reserved uplink control sub-channel by an intra-subframe frequency hopping way includes:

dividing the sub-frame in time domain, each of the reserved uplink control sub-channels corresponding to a time-successive frequency-hop sequence, wherein the frequency-hop sequence continuously occupying the entire sub-frame in time domain, each frequency-hop sequence being assigned on two segments of frequency resource having a distance as far as possible in frequency domain.

4. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 2, wherein,

in the step B, the transmitting on the respective reserved uplink control sub-channels by an intra-subframe frequency hopping way includes:

dividing the sub-frame in time domain, each of the reserved uplink control sub-channels corresponding to a time-successive frequency-hop sequence, the frequency-hop sequence continuously occupying the entire sub-frame in time domain, each frequency-hop sequence being assigned on two segments of the frequency resource having a distance as far as possible in frequency domain.

5. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 2, wherein, in the step A2, the uplink time slots used by the reserved bandwidth are determined to be all the uplink time slots in the frame structure;

in the step A3, the uplink control signaling is symmetrically assigned on both sides of the frequency resource of all the used uplink time slots.

6. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 5, wherein, in the step A3, all the uplink control signaling can be averagely or unequally in time domain and symmetrically in frequency domain assigned on both sides of the frequency resource of all the used uplink time slots.

7. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 6, wherein, in the step A3, all the uplink control signaling being assigned unequally in time domain and symmetrically in frequency domain comprises:

starting with a certain time slot, reserving a minimum resource unit on each side of each time slot in frequency domain, then repeating the operation on next time slot in an increasing or reduction order of the time slot index;

after assigning the last uplink time slot, continuously assigning from the certain time slot, till all the uplink control signaling is assigned completely.

8. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 2, wherein, in the step A2, the uplink time slot used by the reserved bandwidth is determined to be part of the uplink time slots in the frame;

in the step A3, the uplink control signaling is symmetrically assigned on both sides of the frequency resource of the used uplink time slots.

9. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 8, wherein, in the step A2, the uplink time slot used by the reserved bandwidth is fixedly assigned on any uplink time slot in the frame;

in the step A3, all the uplink control signaling is equally assigned on both sides of the frequency resource of the used uplink time slot.

10. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 8, wherein, in the step A2, the part of the uplink time slots are determined in accordance with the maximum number of reserved time slots assigned in the system;

in the step A3, when the number of the uplink time slots increases to exceed the maximum number of reserved time slots, assigning the newly added uplink control signaling on both sides of the frequency resource of the time slots to which reserved frequency resource has been assigned, and assigning no reserved frequency resource to the newly added uplink time slot.

11. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 8, wherein, in the step A3, all the uplink control signaling is averagely or unequally in time domain and symmetrically in frequency domain assigned on both sides of the frequency resource of the used uplink time slots.

12. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 11, wherein, in the step A3, the unequally symmetrical assignation of the uplink control signaling comprises:

starting with a time slot of a certain uplink time slot index, assigning a minimum resource unit on each side of each time slot in frequency domain, then repeating the operation on next time slot in the increasing or reduction order of the time slot index;

after assigning the last uplink time slot, continuously assigning from the time slot of the certain time slot, till all the uplink control signaling is assigned completely.

13. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 3, wherein the step B further includes inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying two short blocks;

or

inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying the two short blocks and occupying two long blocks;

or

inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying the two long blocks, and the two short blocks also transmitting the uplink control signaling.

19. The method for uplink control signaling transmission in a TDD OFDMA system according to claim 4, wherein the step B further includes inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying two short blocks;

or

inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying the two short blocks and occupying two long blocks;

or

inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying the two long blocks, and the two short blocks also transmitting the uplink control signaling.

14. An apparatus for uplink control signaling transmission in a TDD OFDMA system, which is used for individually transmitting non-data associated control signaling in a LTE TDD system, wherein:

comprising a control signaling processing unit and a frequency-hop processing unit;

the control signaling processing unit reserving frequency resource for uplink control channels and assigning the reserved frequency resource, which is on both sides of system bandwidth in frequency domain, based on all uplink control signaling and available uplink time slot resource, so as to form reserved uplink control channels;

the frequency-hop processing unit transmitting the uplink control signaling, which is transmitted on the reserved frequency resource for uplink control channel transmission, by an intra-subframe frequency hopping way on the respective reserved uplink control sub-channels, and a frequency-hop sequence corresponding to the signaling of each terminal UE or a group of UEs.

15. The apparatus for uplink control signaling transmission in a TDD OFDMA system according to claim 14, wherein the processing of the control signaling processing unit reserving frequency resource for the uplink control channel includes:

extracting the uplink-to-downlink time slot ratio and system operating bandwidth from system assignation information, acquiring the total amount of the uplink control signaling need to be transmitted in the reserved frequency resource;

determining uplink time slots used by the reserved frequency resource based on the uplink time slot resource;

assigning all the uplink control signaling to used uplink time slots on both sides of frequency resource of the used uplink time slots.

16. The apparatus for uplink control signaling transmission in a TDD OFDMA system according to claim 14, wherein the frequency-hop processing unit transmitting the uplink control signaling on the respective reserved uplink control sub-channels by the intra-subframe frequency hopping way, including:

dividing the sub-frame in time domain, each of the reserved uplink control sub-channels corresponding to a time-successive frequency-hop sequence, the frequency-hop sequence continuously occupying the entire sub-frame in time domain, each frequency-hop sequence being assigned on two segments of frequency resource having a distance as far as possible in frequency domain.

17. The apparatus for uplink control signaling transmission in a TDD OFDMA system according to claim 14, wherein the control signaling processing unit reserving frequency resource for the uplink control channel includes:

extracting the uplink-to-downlink time slot ratio and system operating bandwidth from system assignation information, acquiring the total amount of the uplink control signaling need to be transmitted on the reserved frequency resource;

determining uplink time slots used by the reserved frequency resource according to the uplink time slot resource;

assigning the uplink control signaling on both sides of the frequency resource of the used uplink time slots;

the frequency-hop processing unit transmitting the uplink control signaling on the respective reserved uplink control sub-channels by an intra-subframe frequency hopping way, including;

dividing the sub-frame in time domain, each of the reserved uplink control sub-channels corresponding to a time-successive frequency-hop sequence, the frequency-hop sequence continuously occupying the entire sub-frame in time domain, and each frequency-hop sequence being assigned on two segments of frequency resource having a distance as far as possible in frequency domain.

18. The apparatus for uplink control signaling transmission in a TDD OFDMA system according to claim 15, wherein the frequency-hop processing unit further inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying two short blocks;

or

the frequency-hop processing unit further inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying two short blocks and occupying two long blocks;

or

the frequency-hop processing unit further inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying two long blocks, and two short blocks transmitting the uplink control signaling.

20. The apparatus for uplink control signaling transmission in a TDD OFDMA system according to claim 16, wherein the frequency-hop processing unit further inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying two short blocks;

or

the frequency-hop processing unit further inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying two short blocks and occupying two long blocks;

or

the frequency-hop processing unit further inserting a pilot symbol into the frequency-hop sequence, the inserted pilot symbol occupying two long blocks, and two short blocks transmitting the uplink control signaling.