Signaling of random access preamble time-frequency location in wireless networks
View Patent ↗Embodiments of the present disclosure provide a base station sub-system, a method of allocating random access configurations and a method of downlink signaling of random access configurations. In one embodiment, the base station sub-system is for use in a wireless communication system and includes an allocator configured to allocate random access configurations having a plurality of time slots that use a single frequency resource. Additionally, the base station sub-system also includes a transmitter configured to signal at least one index of the random access configurations and a random access receiver balancing in time the processing load of the random access detection of different cells served by the base station.
1. A method of allocating random access configurations in a wireless communication network, comprising:
selecting a first random access slot configuration having a plurality of time slots;
assigning the first random access slot configuration to a first cell of the wireless communication network;
selecting a second random access slot configuration having a plurality of non-overlapping time slots with respect to the first random access slot configuration; and
assigning the second random access slot configuration to a second cell of the wireless communication network, wherein the first and second random access slot configurations provide initial time slots that are referenced to a frame boundary.
2. The method as recited in claim 1 wherein a single random access transmission is limited to a duration of one time slot.
3. The method as recited in claim 1 wherein each of the first and second random access slot configurations provides a periodic pattern in time.
4. The method as recited in claim 3 wherein the periodic pattern for each of the first and second random access slot configurations provides a same periodic pattern that is shifted in time.
5. The method as recited in claim 1 wherein the initial time slots for the first and second random access slot configurations are shifted concurrently in time.
6. The method as recited in claim 1 wherein the first and second random access slot configurations are assigned to the same cell.
7. The method as recited in claim 1 wherein periods between the time slots and the non-overlapping time slots decrease for an increase in system bandwidth or random access load of the first and second cells.
8. A method of allocating random access configurations in a wireless communication network, comprising:
selecting a first random access slot configuration having a plurality of time slots;
assigning the first random access slot configuration to a first cell of the wireless communication network;
selecting a second random access slot configuration having a plurality of non-overlapping time slots with respect to the first random access slot configuration; and
assigning the second random access slot configuration to a second cell of the wireless communication network, wherein the first and second random access slot configurations are identified by or referenced to respective first and second cell IDs of the first and second cells.
9. A method of allocating random access configurations in a wireless communication network, comprising:
selecting a first random access slot configuration having a plurality of time slots;
assigning the first random access slot configuration to a first cell of the wireless communication network;
selecting a second random access slot configuration having a plurality of non-overlapping time slots with respect to the first random access slot configuration; and
assigning the second random access slot configuration to a second cell of the wireless communication network, wherein initial time offsets of the time slots and the non-overlapping time slots are derived from respective first and second cell IDs of the first and second cells.
10. A method of allocating random access configurations in a wireless communication network, comprising:
selecting a first random access slot configuration having a plurality of time slots;
assigning the first random access slot configuration to a first cell of the wireless communication network;
selecting a second random access slot configuration having a plurality of non-overlapping time slots with respect to the first random access slot configuration; and
assigning the second random access slot configuration to a second cell of the wireless communication network, wherein the first random access slot configuration is controlled by a first base station a the second random access slot configuration is controlled by a second base station.
11. A method of allocating random access configurations in a wireless communication network, comprising:
selecting a first random access slot configuration having a plurality of time slots;
assigning the first random access slot configuration to a first cell of the wireless communication network;
selecting a second random access slot configuration having a plurality of non-overlapping time slots with respect to the first random access slot configuration; and
assigning the second random access slot configuration to a second cell of the wireless communication network, wherein the first random access slot configuration is controlled by a first base station and the second random access slot configuration is controlled by a second base station and wherein the first and second base stations are the same base station.
12. A method of downlink signaling of random access configurations in a wireless communication network, comprising:
providing a random access configuration having a plurality of time slots and using a single frequency resource, wherein a plurality of pre-defined random access configurations is known apriori by both the base station and the user equipment;
defining a periodic pattern for the random access configuration; and
assigning a time origin for a first time slot of the periodic pattern, wherein both the periodic pattern and the time origin are jointly signaled through an index of the random access configuration.
13. A method of downlink signaling of random access configurations in a wireless communication network, comprising:
providing a random access configuration having a plurality of time slots and using a single frequency resource, wherein a plurality of pre-defined random access configurations is known apriori by both the base station and the user equipment;
defining a periodic pattern for the random access configuration; and
assigning a time origin for a first time slot of the periodic pattern, wherein both the periodic pattern and the time origin are jointly signaled through an index of the random access configuration and wherein broadcast signaling is used to provide the index.