Multiple access digital communicating method in ultra-wideband radio access networks

• US 8,588,190 B2
• Filed: 03/28/2006
• Issued: 11/19/2013
• Est. Priority Date: 03/28/2005
• Status: Active Grant

• Current Assignee: Pantech Corporation (Ideahub, Inc.)
• Original Assignee: Pantech Co. Ltd. (Pantech Incorporated)
• Inventors: Sung, Dan Keun, JUNG, Bang Chul, Hwang, Ho Young, Jung, Chang Yong, Hong, Young Jun, Chong, Jo Woon
• Primary Examiner(s): CHAN, SAI MING
• Application Number:
  US11/910,143
• Publication Number:
  US 20080165746A1
• Time in Patent Office: 2,793 Days
• Field of Search: 370/337, 370/468
• US Class Current: 370/337
• CPC Class Codes: H04B 7/2671 Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A multiple access digital communication method in ultra-wideband (UWB) radio access network is provided. More specifically, a multiple access technique in UWB communication channels is provided where UWB communication channels can be more efficiently used and collisions between multiple access user nodes can be more effectively avoided when the channels have a great multiple path fading. The digital communication method for use in an uplink in a UWB communication system includes the steps of: receiving data symbols from respective nodes, in which the data symbols are transmitted according to respective orthogonal time hopping patterns; checking whether there is a collision of the orthogonal time hopping patterns; and decoding the data symbols depending on whether data symbols of nodes involved in the collision of the orthogonal time hopping patterns are the same.

Claims

1. A digital communication method between user nodes and a management node, comprising:

allocating access resources to the user nodes to allow the user nodes to attempt multiple accesses by a scheduling based orthogonal time division method or by an orthogonal time hopping method, according to data transmission rates of services requested by the respective user nodes;

receiving a first signal transmitted according to the scheduling based orthogonal time division method during an orthogonal time division access period;

receiving a second signal transmitted according to the orthogonal time hopping method during an orthogonal time hopping access period that is not overlapped with the orthogonal time division access period; and

classifying, by the management node, the user nodes into at least one group, and attempting communication by groups in a mixed mode of the orthogonal time division method and the orthogonal time hopping method.

2. The method of claim 1, wherein a power saving period is assigned in consideration of battery power consumption of the respective user nodes, and the mixed mode of the orthogonal time hopping method and the orthogonal time division method is used in an active period which is not the power saving period.

3. The method of claim 1, wherein the user nodes requesting high-speed data services accommodate a scheduling based multiple access, while the user nodes requesting mid/low speed data services accommodate the orthogonal time hopping method.

4. The method of claim 1, wherein reciprocal conversion of the multiple access methods is possible during communication.

5. The method of claim 1, further comprising one of the following:

assigning time resources flexibly without distinguishing between uplink and downlink periods;

distinguishing between uplink and downlink periods, scheduling and mapping uplink and downlink data of a user node in orthogonal time division access uplink and downlink periods, and hopping time resources in orthogonal time hopping access uplink and downlink periods for communication; and

serving the uplink and downlink data by users in the orthogonal time division access period and thereby, reducing battery power consumption of the respective user nodes.

6. The method of claim 1, wherein the user nodes are classified into at least one group, and the orthogonal time hopping access method is used for the respective groups while the orthogonal time division method is used for the entire group.

7. The method of claim 1, wherein the classification of the user nodes into at least one group is determined by one of the following conditions:

data transmission rates requested by users;

distances between the respective user nodes and the management node;

received Signal to Interference and Noise Ratio (SINR) values in the respective user nodes or the management node; and

user node ID numbers.

8. The method of claim 1, wherein after the user nodes are classified into at least one group, the user node groups are reclassified periodically or if necessary.

9. The method of claim 8, further comprising one of the following:

reclassifying user node groups per frame;

reclassifying user nodes groups in ‘

n’

frame unit (n>

1); and

reclassifying user node groups every time a user node joins with the management node through a contention access period for communication setup and communication initiation.

10. The method of claim 1, wherein time hopping patterns in the orthogonal time hopping multiple access method are managed by one of the following methods:

generating a time hopping pattern per frame by using an intrinsic ID assigned to each frame and an intrinsic identifier assigned to a user node;

assigning the time hopping patterns to users per frame by managing time hopping patterns in the orthogonal time hopping multiple access method in a table;

assigning the time hopping patterns in the orthogonal time hopping multiple access method in ‘

n’

frame unit (n>

1); and

assigning the time hopping patterns in the orthogonal time hopping multiple access method at a point when a user node joins with the management node through a contention access period for communication setup and communication initiation, and restoring the assigned time hopping patterns when service(s) of the user node ends.

11. The method of claim 1, wherein a node with information to be sent apart from specific time hopping patterns in the orthogonal time hopping multiple access method provides the management node with the data and a brief information about the presence of the data by using a specific time hopping pattern.

12. The method of claim 1, wherein the management node does not define a control signal channel regarding whether the respective user nodes have information to be sent for a downlink in the orthogonal time hopping multiple access method, but builds a bitmap of 1 bit information by users using the bitmap information in a beacon period and includes the bitmap in beacon information to inform the users.

13. The method of claim 1, wherein the management node does not define a control signal channel regarding whether the respective user nodes have information to be sent for a downlink in the orthogonal time division multiple access method, but builds a bitmap of 1 bit information by users using the bitmap information in a beacon period and includes the bitmap in beacon information to inform the users.

14. The method of claim 1, wherein a control signal channel indicating whether the respective nodes have information to be sent is not defined, but a received energy level of the management node is used to check whether data of the respective nodes exist in a frame.

15. The method of claim 1, wherein the management node does not define a control signal channel regarding whether the respective user nodes have information to be sent for a downlink in the orthogonal time hopping multiple access method, but includes only a user ID with information to be sent using the user ID in the beacon period to inform the users.

16. The method of claim 1, wherein the management node does not define a control signal channel regarding whether the respective user nodes have information to be sent for a downlink in the orthogonal time division multiple access method, but includes only a user ID with information to be sent using the user ID in the beacon period to inform the users.