Systems and methods for uplink signalling

• US 9,974,060 B2
• Filed: 09/11/2008
• Issued: 05/15/2018
• Est. Priority Date: 09/12/2007
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Novak, Robert, Fong, Mo-Han, Vrzic, Sophie, Yuan, Jun, Yu, Dong-Sheng, Ma, Jianglei
• Primary Examiner(s): Shah, Chirag
• Assistant Examiner(s): SMITH, JOSHUA Y
• Application Number:
  US12/677,438
• Publication Number:
  US 20120063409A1
• Time in Patent Office: 3,533 Days
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0055 Physical resource allocation for ACK/NACK for physical mapping arrangements in ARQ protocols H04L1/1861
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

Methods, base stations and access terminals for uplink signalling are provided. Resource request channel characteristics such as location in time-frequency, sequence, time slot, are assigned to each access terminal to distinguish their resource requests from the resource requests of other access terminals. Access terminals make requests using a resource request on a resource request channel having the assigned characteristics. The base station can then determine which access terminal transmitted the resource request based on the resource request channel characteristics of the resource request channel upon which the resource request was received. The base station then transmits a response to the request which may for example be a new resource allocation, a default allocation or a renewal of a previous allocation.

Claims

1. A method comprising:

assigning a respective set of at least one resource request channel characteristics to each of a plurality of access terminals for each access terminal to use to request uplink transmission resources, each set of at least one resource request channel characteristics being distinct from each other set of at least one resource request channel characteristics;

receiving a resource request on a resource request channel;

determining that a particular access terminal transmitted the resource request, the determining based on at least one resource request channel characteristic of the resource request channel upon which the resource request was received; and

transmitting a response to the request to the particular access terminal,

wherein;

the assigning the respective set of at least one resource request channel characteristics to each of the plurality of access terminals comprises allocating a first OFDM-based time-frequency resource for uplink signaling that at least partially overlays in time and frequency a second OFDM-based time-frequency resource allocated for at least one of traffic or uplink control signaling,

the resource request received from the particular access terminal overlays, within the first OFDM-based time-frequency resource, traffic or uplink control signaling transmitted by another access terminal in the second OFDM-based time-frequency resource; and

the method further includes, after receiving the resource request, using interference cancellation to remove effects of the resource request overlaying the second OFDM-based time-frequency resource in order to receive the traffic or uplink control signaling of the another access terminal.

2. The method of claim 1 wherein:

the resource request is a request for a previously assigned uplink transmission resource; and

the response to the request is at least one of;

a) assignment of the previously assigned uplink transmission resource;

or

b) a renewal of a configured service.

3. The method of claim 1, wherein:

the resource request is a message containing at least one parameter comprising at least one of a channel quality indicator (CQI), a packet format, or a CQI with sub-band index.

4. The method of claim 1, wherein:

the response to the resource request indicates at least one of;

a new resource assignment;

a default resource assignment;

an assignment of a previously assigned resource;

or

a renewal of a configured service; and

the method further comprises;

receiving an uplink transmission on the resource assignment from the particular access terminal; and

as part of the uplink transmission, receiving an embedded configuration or reconfiguration of the resource assignment.

5. The method of claim 4, wherein:

the receiving the embedded configuration or reconfiguration of the resource assignment comprises receiving a packet comprising a header and an appended field, the appended field comprising the embedded configuration or reconfiguration of the resource assignment, and the header indicating the presence of the appended field.

6. The method of claim 1, wherein the resource request indicates a renewal of a previously configured service for the particular access terminal.

7. The method of claim 6, wherein the resource request comprises an on/off toggle indication to renew the previously configured service with previous or existing parameters.

8. A method comprising:

assigning a respective set of at least one resource request channel characteristics to each of a plurality of access terminals for each access terminal to use to request uplink transmission resources, each set of at least one resource request channel characteristics being distinct from each other set of at least one resource request channel characteristics;

receiving a resource request on a resource request channel;

determining that a particular access terminal transmitted the resource request, the determining based on at least one resource request channel characteristic of the resource request channel upon which the resource request was received; and

transmitting a response to the resource request to the particular access terminal,

wherein;

the assigning the respective set of at least one resource request channel characteristics to each of the plurality of access terminals comprises allocating a resource for uplink signaling that is at least partially superimposed upon an OFDM-based time-frequency resource allocated for at least one of traffic or uplink control signaling, and

the allocating the resource for uplink signaling that is at least partially superimposed upon the OFDM-based time-frequency resource allocated for at least one of traffic or uplink control signaling comprises

allocating a distinct persistent recurring resource for uplink signaling per access terminal within the OFDM-based time-frequency resource that is at least partially superimposed upon the OFDM time-frequency resource allocated for at least one of uplink traffic or uplink control signaling.

9. The method of claim 8, wherein the resource request includes at least one of:

a channel quality indicator (CQI), a packet format, or a CQI with a sub-band index.

10. A method comprising:

receiving, for the purpose of initial access by a particular access terminal, an access request on a random access channel using a randomly selected random access channel signaling identifier (ID);

after receiving the access request, assigning one of a set of random access channel signaling IDs to the particular access terminal for use in transmitting resource requests;

assigning a respective set of at least one resource request channel characteristics to each of a plurality of access terminals for each access terminal to use to request uplink transmission resources, each set of at least one resource request channel characteristics being distinct from each other set of at least one resource request channel characteristics, the plurality of access terminals including the particular access terminal, and wherein the set of at least one resource request channel characteristics for the particular access terminal comprises the assigned random access channel signaling ID;

receiving a resource request on the random access channel using the random access channel signaling ID assigned to the particular access terminal;

determining that the particular access terminal transmitted the resource request, the determining based on at least one resource request channel characteristic of the resource request channel upon which the resource request was received; and

transmitting a response to the resource request to the particular access terminal,

wherein the assigning the respective set of at least one resource request channel characteristics to each of the plurality of access terminals comprises allocating a resource for uplink signaling that is at least partially superimposed upon an OFDM-based time-frequency resource allocated for at least one of traffic or uplink control signaling.

11. The method of claim 10, wherein the access request on the random access channel is received on a dedicated resource.

12. The method of claim 10, wherein the access request on the random access channel is received on a resource that is at least partially superimposed upon the OFDM-based time-frequency resource allocated for uplink control signaling.

13. The method of claim 10, wherein the access request on the random access channel is received on a resource that is at least partially superimposed upon the OFDM-based time-frequency resource allocated for uplink traffic.

14. The method of claim 12, further comprising:

performing interference cancellation to remove interference due to the access request to receive content on the OFDM-based time-frequency resource allocated for uplink control signaling.

15. The method of claim 10, wherein the random access channel signaling ID comprises one or a combination of:

a spreading sequence selected from a plurality of possible spreading sequences;

a time-frequency location selected from a plurality of possible time-frequency locations;

a time slot selected from a plurality of possible time slots;

or

an interlace selected from a plurality of possible interlaces.

16. The method of claim 10, further comprising:

responding to the access request with a downlink resource assignment that requests additional information from the particular access terminal.

17. The method of claim 10, further comprising:

responding to the access request with a downlink resource assignment message that includes user ID information.

18. The method of claim 10, wherein the random access channel signaling ID comprises:

a spreading sequence selected from;

a first set of spreading sequences, when the access request is received from an access terminal with a previously assigned access terminal ID;

or

a second set of spreading sequences, when the access request is received from an access terminal without a previously assigned access terminal ID,

wherein the second set of spreading sequences is distinct from the first set of spreading sequences.

19. The method of claim 10, wherein:

the random access channel uses a single sequence assigned for all access terminals to use for initial access;

a set of N_T resource blocks is divided into M sets of one or more time-frequency blocks for random access; and

the access request is received on a randomly selected one of the M sets of one or more time-frequency blocks.

20. The method of claim 19, wherein the access request is received on a randomly selected subframe within a frame or superframe.