Communication protocol for spread sprectrum wireless communication system
View Patent ↗A communication protocol for use in a mobile cellular communication system using time division duplex establishes a communication channel between a user station (e.g., a handset) and a base station in a time slot by assigning a first time segment within the time slot for a user station transmission and assigning a second time segment within the time slot for a base station transmission. The protocol also provides for virtual time slots wherein a time segment assigned for periodic transmission from the base station to a given user station may be non-contiguous with respect to the time segment assigned for periodic transmissions from the user station to the base station.
1. A wireless device comprising:
a transceiver adapted to transmit and receive spread spectrum signals wherein the wireless device is adapted to transmit a user signal during a first time segment of a first time slot of a polling loop time cycle, the polling loop time cycle is comprised of a plurality of time slots and each time slot comprises a first time segment and a second time segment, wherein the wireless device is configured to receive a base signal, responsive to the user signal, in the second time segment of a second time slot; and wherein the number of time segments between the first time slot and the second time slot is variable.
2. The device of claim 1 wherein the polling loop time cycle is followed by a second polling loop time cycle that has the same duration.
3. The device of claim 1 wherein each of the plurality of time slots has the same duration.
4. The device of claim 1 wherein each of the plurality of time slots further comprises a guard interval.
5. The device of claim 1 wherein the user signal comprises a user preamble and a user sounding gap.
6. The device of claim 1 wherein the base signal comprises a power adjustment command directed to said user station.
7. The device of claim 6 wherein the power adjustment command is based on a received signal strength of the user signal.
8. A base station for wireless communication comprising:
a transceiver adapted to transmit and receive spread spectrum signals in reserved segments of a plurality of time slots, each time slot comprising a first time segment and a time second segment, wherein at least one of the spread spectrum signals to be transmitted comprises a general polling signal in the first segment of a time slot and at least one of the spread spectrum signals to be received comprises a general polling response signal from one or more user stations in the second segment of an available time slot; and
a processing circuit coupled to the transceiver to process channel characterization information of the spread spectrum signals to be received, and to select one or more of a plurality of antennas and transmit power level for use in a subsequent transmission.
9. The base station of claim 8 wherein the base station is further adapted to transmit a power adjustment command to each user station for the user station to adjust its transmission power level.
10. The base station of claim 8 wherein each of the plurality of time slots comprises a user station transmit field, a base processor gap, a guard time, and a base transmit field.
11. The base station of claim 8 wherein the general polling response signal includes information identifying a particular user identification and information for sounding available communication links between the base station and the particular user station.