Method for dynamic allocation of channels in a code division multiple access packet data system

• US 7,218,621 B2
• Filed: 12/26/2000
• Issued: 05/15/2007
• Est. Priority Date: 12/23/1999
• Status: Expired due to Fees

• Current Assignee: LG-Ericsson Company Limited (Telefonaktiebolaget LM Ericsson)
• Original Assignee: LG Nortel Company Limited
• Inventors: Lee, Seoung-Young
• Primary Examiner(s): Pham; Chi
• Assistant Examiner(s): Phan; Tri H.
• Application Number:
  US09/745,873
• Publication Number:
  US 20010005378A1
• Time in Patent Office: 2,331 Days
• Field of Search: 370/320, 370/335, 370/342, 370/441, 370/450, 370/479, 370/459, 375/130, 375/140, 375/141, 375/145, 455/450, 455/452.1
• US Class Current: 370/335
• CPC Class Codes: H04B 7/2628 using code-division multiple access [CDMA] or spread spectrum multiple access [SSMA] H04B7/2618 takes precedence
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04W 48/08 Access restriction or access information delivery, e.g. discovery data delivery signalling during connection H04W76/00
• CPC Class Codes: H04W 72/04 Wireless resource allocation
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling

Abstract

A CDMA packet data system is disclosed that can dynamically allocate channels in the CDMA packet data system). Using the disclosed dynamic allocation method, the utilization efficiency of multiple channels is increased and the transmission rate of packet data is increased. This is because a static, specific channel is not allocated to each terminal, but rather the system dynamically allocates multiple channels to each mobile terminal. Thus, the base station provides information on all channels used in the system to multiple terminals. The terminals check the occupied state of each channel before transmitting packet data, and thereafter transmitting packet data through an unoccupied channel.

Claims

1. A method for allocating channels in a CDMA packet data system, comprising:

providing channel availability information for each of a plurality of channels, the channel availability information being provided from a base station to each of a plurality of terminals such that each of the terminals receives the channel availability information of each of the plurality of channels;

dynamically allocating available channels to corresponding ones of the plurality of terminals to allow transmission of packet data according to an available or unavailable state of each channel; and

transmitting a state signal from the base station over each of the allocated channels indicating the unavailable state of the allocated channels,

wherein dynamically allocating the available channels comprises;

for each of the plurality of terminals, simultaneously monitoring each of the plurality of channels in parallel to detect whether the state signal indicating channel availability indicates a channel is idle.

2. The method of claim 1, wherein the base station transmits information containing all PN codes used by the base station to each one of the plurality of terminals.

3. The method of claim 1, wherein dynamically allocating the available channels comprises:

sending a packet of data through an idle channel, if an idle channel signal is detected; and

waiting until an idle channel is available, if an occupied channel signal is detected.

4. The method of claim 1, wherein simultaneously monitoring each of the plurality of channels comprises detecting on each of the plurality of channels one of a power control signal and an idle signal, wherein the power control signal is an occupied channel signal indicating unavailability of the respective channel, and the idle channel signal indicates channel availability of the respective channel.

5. The method of claim 1, wherein transmitting the state signal from the base station comprises:

transmitting a power control signal through a downward link channel corresponding to the allocated channel through which a packet of data is transmitted when synchronization is acquired using a preamble of the data packet; and

transmitting a channel occupancy release signal through the downward link channel corresponding to the allocated channel through which the data packet was transmitted when the data packet has been fully received.

6. The method of claim 1, wherein each of the available channels are dynamically allocated to different ones of the plurality of terminals.

7. The method of claim 6, wherein each one of the plurality of channels comprises a traffic channel and a signaling channel, and wherein the packet data is transmitted over the data channel and the state signal is transmitted over the signaling channel.

8. The method of claim 1, wherein the terminal is not pre-allocated to a specific one of the plurality of channels.

9. A method for transmitting packet data by dynamically allocating channels in a communication system, comprising:

providing channel availability information for each of a plurality of channels, the channel availability information being provided from a base station to each of a plurality of terminals such that each of the terminals receives the channel availability information of each of the plurality of channels;

for each of the plurality of terminals, monitoring the channel availability information for each of the plurality of channels;

determining which, if any, of all of the plurality of channels is in an occupied state using a corresponding plurality of PN codes state, wherein determining the occupied state comprises simultaneously multiplying the PN code for each channel by a signal received from a base station, and the multiplication is performed at a rate equal to a power control signal transmission rate of the base station; and

one of transmitting a data packet through a dynamically allocated unoccupied one of the plurality of channels for transmission, and monitoring each one of the plurality of channels to determine when the occupied state of one of the channels is released, if there is no channel in the unoccupied.

10. The method of claim 9, further comprising:

establishing in a base station the plurality of channels for data communication, each one of the channels having a unique PN code;

receiving from the base station the unique PN codes of each of the plurality of channels; and

monitoring each of the plurality of channels to determine and occupy the state of each respective channel.

11. The method of claim 9, wherein a terminal is not pre-allocated to a specific one of the plurality of channels.

12. A method for transmitting packet data by dynamically allocating channels in a communication system, comprising:

providing channel availability information for each of a plurality of channels, the channel availability information being provided from a base station to each of a plurality of terminals such that each of the terminals receives the channel availability information of each of the plurality of channels;

for each of the plurality of terminals, monitoring the channel availability information for each of the plurality of channels;

determing which, if any, of all of the plurality of channels is in an occupied state using a corresponding plurality of PN codes state; and

one of transmitting a data packet through a dynamically allocated unoccupied one of the plurality of channels for transmission, and monitoring each one of the plurality of channels to determine when the occupied state of one of the channels is released, if there is no channel in the unoccupied, wherein transmitting the data packet comprises;

determining that a channel using a prescribed one of the plurality of PN codes is in an idle state and transmitting the data packet on the idle channel, if a base station transmits an idle signal on the channel, and

determining that each channel is in an occupied state and waiting until one of the channels becomes idle if the base station transmits a power control signal on each channel.

13. The method of claim 12, wherein a signal transmitted from the base station is multiplied by each one of the plurality of PN codes to determine if the channel associated with a prescribed one of the PN codes is occupied or idle.

14. The method of claim 13, wherein a power control signal transmitted on a channel indicates that the channel is occupied.

15. The method of claim 13, wherein each channel has a unique PN code.

16. The method of claim 13, wherein each channel comprises a signaling channel and a traffic channel.

17. The method of claim 12, wherein a terminal transmitting the data packet has stored in the terminal the PN code for each one of the plurality of channels.

19. The method of claim 17, wherein each one of the plurality of terminals has stored therein the unique PN code of each of the plurality of channels.

18. A method for informing a plurality of terminals of an occupied or unoccupied state of a plurality of channels of a CDMA system, comprising:

providing a unique PN code for each of the plurality of channels used in the CDMA system, the unique PN code being provided from a base station to each one of a plurality of terminals in communication with the base station such that each of the terminals receives the unique PN code for each of the plurality of channels;

for each of the plurality of terminals, monitoring each of the plurality of channels to detect a signal that indicates an idle channel;

transmitting a power control signal over an occupied channel using the PN code of the occupied channel, wherein the power control signal is transmitted on a channel when tbe base station acquires synchronization and phase of a data packet transmitted by one of the plurality of terminals; and

transmitting an idle signal over the idle channel using the same PN code as the idle channel, wherein the idle signal is transmitted on the channel when the base station has received the entire packet of data.

20. The method of claim 18, wherein a terminal is not pre-allocated to a specific one of the plurality of channels.

21. The method of claim 18, wherein the plurality of terminals are configured to simultaneously monitor channel availability information for each of the plurality of channels of the base station and to transmit data on a first available channel when an occupied state of the first available channel is released.

22. A method of allocating a plurality of channels in a CDMA packet data system, comprising:

receiving channel availability information for each of the plurality of channels from a base station such that each of a plurality of terminals receives the channel availability information of each of the plurality of channels;

dynamically allocating an available channel and transmitting a data packet to the base station using the allocated channel; and

receiving from the base station a power control signal on the allocated channel, wherein the power control signal is released when the data packet has been transmitted,

wherein the plurality of terminals are configured to simultaneously monitor channel availability information for each of the plurality of channels of the base station and to transmit data on a first available channel when an occupied state of the first available channel is released.

23. The method of claim 22, wherein the power control signal indicates unavailability of the channel.

24. The method of claim 22, wherein a terminal is not pre-allocated to a specific one of the plurality of channels.

25. A method of allocating a plurality of channels in a CDMA packet data system, comprising:

receiving channel availability information for each of the plurality of channels from a base station such that each of a plurality of terminals receives the channel availability information of each of the plurality of channels;

dynamically allocating an available channel and transmitting a data packet to the base station using the allocated channel; and

receiving from the base station a power control signal on the allocated channel,

wherein the plurality of terminals are configured to simultaneously monitor channel availability information for each of the plurality of channels of the base station and to transmit data on a first available channel when an occupied state of the first available channel is released, wherein each of the plurality of terminals simultaneously monitors each of the channels in parallel to detect a signal that indicates an idle channel.