Method and system for resolution of channel access in data transmission systems
First Claim
Patent Images
1. A method for resolving contention between subscriber units for a channel in a slotted communication system, comprising the steps of:
- A) generating randomly, by each of plurality of subscriber units, a predetermined number of echo bits,B) transmitting, by each of the plurality of subscriber units, a packet segment having the predetermined number of echo bits, to a base site, utilizing a devoted out-of-band signaling channel for transmission of echo bits and transmit access requests and utilizing an in-band signaling channel for transmission of user data,C) decoding, by the base site, a received transmission from at least one of the plurality of subscriber units, and transmitting the echo bits received to subscriber units whose transmissions were received, wherein the devoted out-of-band signaling channel is utilized for transmission of echo bits,D) recycling to generating randomly a predetermined number of echo bits by a subscriber unit whose echo bits match the echo bits transmitted by the base site until a packet ends.
1 Assignment
0 Petitions
Accused Products
Abstract
A novel scheme efficiently indicates to a plurality of users which user has been granted access to a multi-access packet channel. Transmission and reception of a predetermined limited number of echo bits per timeslot reduces bandwidth usage, and over the duration of a packet, these bits are equivalent to a variable length random identification number which is used for identifying which user has been granted access.
37 Citations
6 Claims
-
1. A method for resolving contention between subscriber units for a channel in a slotted communication system, comprising the steps of:
-
A) generating randomly, by each of plurality of subscriber units, a predetermined number of echo bits, B) transmitting, by each of the plurality of subscriber units, a packet segment having the predetermined number of echo bits, to a base site, utilizing a devoted out-of-band signaling channel for transmission of echo bits and transmit access requests and utilizing an in-band signaling channel for transmission of user data, C) decoding, by the base site, a received transmission from at least one of the plurality of subscriber units, and transmitting the echo bits received to subscriber units whose transmissions were received, wherein the devoted out-of-band signaling channel is utilized for transmission of echo bits, D) recycling to generating randomly a predetermined number of echo bits by a subscriber unit whose echo bits match the echo bits transmitted by the base site until a packet ends. - View Dependent Claims (2)
-
-
3. A system for resolving contention between a plurality of subscriber units for transmitting data in packets in a slotted communication system to a base site, comprising:
-
A) the plurality of contention-resolving subscriber units, for transmitting the packets on a packet channel, wherein each contention-resolving subscriber unit includes a contention resolver for randomly generating echo bits and transmitting a packet having the echo bits and a transmit access request to the base site until in response to receiving echo bits from the base site one of;
where the echo bits received from the base site match the echo bits transmitted by the contention-resolving subscriber unit, transmitting data in packets on the packet channel; and
where the echo bits received from the base site are non-matching with the echo bits transmitted by the contention-resolving subscriber unit, refraining from transmitting, wherein a devoted out-of-band signaling channel is utilized for transmission of echo bits and transmit access requests and an in-band signaling channel is utilized for transmission of user data;B) the base site, responsive to the packets from the contention-resolving subscriber units, for decoding a first received packet, granting access for the packet channel to a contention-resolving subscriber unit of the first received packet, and transmitting, to the plurality of contention-resolving subscriber units, the echo bits of the contention-resolving subscriber unit of the first received packet to indicate that the contention-resolving subscribe unit of the first received packet has been granted access to the packet channel, wherein the devoted out-of-band signaling channel is utilized for transmission of echo bits. - View Dependent Claims (4)
-
-
5. A method for resolving contention between a plurality of subscriber units for transmitting data packets to a base site using a channel in a slotted communication system, comprising the steps of:
-
each subscriber unit; A) generating a predetermined number of random echo bits; B) setting echo bits to be transmitted to the base site to the random echo bits for the subscriber unit and placing the echo bits in a next data segment to be transmitted, including utilizing a devoted out-of-band signaling channel for transmission of echo bits and transmit access requests; C) transmitting the next data segment containing the random echo bits to the base site, including utilizing an in-band signaling channel for transmission of user data; D) waiting to receive a response segment transmitted from the base site; E) determining whether the response segment equals the random echo bits of the subscriber unit, and where the response segment equals the random echo bits of the subscriber unit, recycling to step A; where the response segment is unequal to the random echo bits of the subscriber unit, disabling a transmitter of the subscriber unit; and the base site, operating in parallel with the subscriber units; F) waiting to receive a transmitted data segment containing the random echo bits from one of the plurality of subscriber units; G) upon receiving the transmitted data segment, setting echo bits for the response segment equal to the random echo bits of the received data segment; and H) transmitting the response segment with the random echo bits of the received data segment to the plurality of subscriber units wherein the random echo bits in the response segment are the random echo bits of the subscriber unit that is granted access to the channel, wherein the devoted out-of-band signaling channel is utilized for transmission of echo bits. - View Dependent Claims (6)
-
Specification