Random access channel hopping for frequency division multiplexing access systems

• US 8,559,362 B2
• Filed: 11/03/2006
• Issued: 10/15/2013
• Est. Priority Date: 11/04/2005
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Vujcic, Dragan, Fischer, Patrick
• Primary Examiner(s): Lai, Andrew
• Assistant Examiner(s): ANDREWS, LEON T
• Application Number:
  US12/092,560
• Publication Number:
  US 20080267126A1
• Time in Patent Office: 2,538 Days
• Field of Search: None
• US Class Current: 370/319
• CPC Class Codes: H04B 7/2637 for logical channel control
• CPC Class Codes: H04J 13/102 Combining codes
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04W 74/0866 using a dedicated channel for access
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method of coordinating resources for repetition of random access bursts performed by a mobile terminal, the method comprising: determining groups of access slots based on parameters from a network, wherein each access slot is defined by any combination of frequency, time and code, and the access slots are organized according to a frequency pattern; transmitting an access burst on an access slot from a chosen group of access slots; and re-transmitting the access burst on the next access slot from the chosen group of access slots.

Claims

1. A method of coordinating resources for repetition of random access bursts performed by a mobile terminal, the method comprising:

determining, by the mobile terminal, groups of access slots based on parameters from a network, wherein the access slots are organized according to a frequency pattern and each access slot is defined by at least frequency, time or code;

transmitting, by the mobile terminal, an access burst on an access slot of a chosen group of the groups of access slots; and

re-transmitting, by the mobile terminal, the access burst on a next access slot of the chosen group,

wherein the groups of access slots comprise;

a first group of access slots corresponding to a first path loss greater than or equal to a first threshold value;

a second group of access slots corresponding to a second path loss less than the first threshold value and greater than a second threshold value; and

a third group of access slots corresponding to a third path loss less than the second threshold value; and

wherein the first path loss, the second path loss and the third path loss represent a signal attenuation between the mobile terminal and the network.

2. The method of claim 1, wherein the re-transmitting is performed when a negative acknowledgement is received or when no response is received from the network.

3. The method of claim 1, wherein the frequency pattern is static or dynamic.

4. The method of claim 1, wherein the frequency pattern is based on a Random Access Channel (RACH) Allocation Index Offset.

5. The method of claim 1, wherein the determining is based on dedicated signaling, broadcast signaling or multicast signaling.

6. The method of claim 1, wherein at least one access slot of the first group or the second group is in a single sub-frame.

7. The method of claim 1, wherein an access slot of the first group and an access slot of the second group are in a same sub-frame.

8. The method of claim 6, wherein one or more sub-frames subsequent to the single sub-frame contain scheduled data transmission information.

9. The method of claim 1, wherein transmitting the access burst comprises:

transmitting to the network, on a contention based channel, a preamble and a message payload containing information on uplink resources needed, priority, a reason for random access, and a random identifier (ID) to assist in resolution of contention;

receiving, from the network, scheduled resources comprising necessary timing advance information to be used on an uplink transmission, a requested scheduling grant, and other required information; and

transmitting third layer (L3) messages, Medium Access Control (MAC) data or control protocol data units (PDUs) using the scheduled resources.

10. The method of claim 1, wherein transmitting the access burst comprises:

transmitting to the network, on a contention based channel, only a preamble;

receiving signalling resources allocated from the network;

sending a scheduling grant on the signaling resources to allow the network to adjust resource allocation depending on needs of the mobile terminal for message payload part transmission;

receiving, from the network, scheduled resources comprising necessary timing advance information to be used on an uplink transmission, a requested scheduling grant, and other required information; and

transmitting third layer (L3) messages, Medium Access Control (MAC) data or control protocol data units (PDUs) using the scheduled resources.

11. The method of claim 1, wherein transmitting the access burst comprises:

transmitting to the network, on a specific resource reserved for a Random Access Channel (RACH) procedure, a preamble together with a Cell-Radio Network Temporary Identity (C-RNTI), a resource request (RR), and a reason for random access, wherein the C-RNTI and the RR are protected by channel coding; and

receiving an uplink data resource allocation from the network.

12. The method of claim 11, wherein the C-RNTI and the RR are further protected by additional redundancy.

13. The method of claim 1, wherein transmitting the access burst comprises:

transmitting, to the network, a preamble on a specific resource reserved for a Random Access Channel (RACH) procedure;

receiving a specific resource allocation from the network;

transmitting a resource request (RR), a Cell-Radio Network Temporary Identity (C-RNTI), a reason for random access, and part of a Radio Resource Control (RRC) message using the specific resource allocation; and

receiving an uplink data resource allocation from the network.

14. A method of coordinating resources for repetition of random access bursts performed by a network, the method comprising:

configuring, by the network, parameters for a terminal to determine groups of access slots, wherein the access slots are organized according to a frequency pattern and each access slot is defined by at least frequency, time or code;

using, by the network, the configured parameters to determine when resources should not be allocated for other uplink transmissions; and

transmitting, by the network, the configured parameters to the terminal,

wherein the groups of access slots comprise;

a first group of access slots corresponding to a first path loss greater than or equal to a first threshold value;

a second group of access slots corresponding to a second path loss less than the first threshold value and greater than a second threshold value; and

a third group of access slots corresponding to a third path loss less than the second threshold value; and

wherein the first path loss, the second path loss and the third path loss represent a signal attenuation between the terminal and the network.

15. The method of claim 14, further comprising:

receiving a transmission of an access burst from the terminal on a first access slot.

16. The method of claim 15, further comprising:

receiving a re-transmission of the access burst by the terminal on a next access slot belonging to a same group as the first access slot.

17. The method of claim 14, wherein the parameters comprise a Random Access Channel (RACH) Allocation Index Offset.