Slot hopped FD/TD/CDMA

• US 5,291,475 A
• Filed: 03/27/1992
• Issued: 03/01/1994
• Est. Priority Date: 03/27/1992
• Status: Expired due to Term

• Current Assignee: Motorola Mobility, Inc. (Lenovo Group Ltd.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Bruckert, Eugene J.
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): Patel, Ajit
• Application Number:
  US07/859,175
• Time in Patent Office: 704 Days
• Field of Search: 370/95.1, 370/95.2, 370/95.3, 370/52, 370/50, 375/1, 375/115, 415/52.1, 415/63
• US Class Current: 370/330
• CPC Class Codes: H04B 1/713 using frequency hopping
• CPC Class Codes: H04B 1/7143 Arrangements for generation of hop patterns
• CPC Class Codes: H04B 1/715 Interference-related aspects
• CPC Class Codes: H04B 2001/7154 with means for preventing interference
• CPC Class Codes: H04B 7/2643 using time-division multiple access [TDMA] H04B7/2615, H04B7/2618 take precedence
• CPC Class Codes: H04J 13/16 Code allocation

Abstract

In a wireless frequency and time division multiple access (FD/TDMA) communications system having time-slotted communications channels, there is provided a method of and apparatus for hopping wireless communications. It comprises sequencing slot assignments and sequencing frequency assignments, such that a multiplicity of frequencies are thereby usable at each site of a cellular FD/TDMA system without regard to local partitioning among surrounding uses thereof. The effect would be to probablistically reduce the interference, not only by the number of hopping frequencies, but by a factor of the number of time slots per frame.

Claims

1. In a wireless frequency and time division multiple access, FD/TDMA, communications system for transmitting communication signals, said FD/TDMA system having communication channels defined by a plurality of slots within a frame, a hopped wireless communications device comprising, operatively coupled in series:

means for assigning, sequentially by frame, one of said communication signals to at least one slot at a time of said plurality of slots such that each of said plurality of slots is assigned to said communication signal according to a predetermined slot sequence;

and means for assigning, sequentially, said one of said communication signals to at least one frequency at a time of a plurality of frequencies such that each of said plurality of frequencies is assigned to said communication signal according to a predetermined frequency sequence,

wherein said means for assigning said one of said communication signals to said slot is prime with respect to said means for assigning said one of said communication signals to said frequency.

2. The device as claimed in claim 1, wherein such primacy is established by a means for co-ordinating said means for assigning said one of said communication signals to said slot and said means for assigning said one of said communication signals to said frequency.

3. The device as claimed in claim 1, wherein said plurality of slots are cyclically allocated forwardly and backwardly across the slots within said frame by said means for assigning said one of said communication signals to said slot.

4. The device as claimed in claim 1, wherein a repetition of said slot assignment of said plurality of slots is related to a frame allocation rate.

5. A device as claimed in claim 1, wherein a repetition of said slot assignment of said plurality of slots is related to the frame allocation rate such that doubling the number of said slots operates with both a full-rate and a half-rate coded speech.

6. In a wireless frequency and time division multiple access (FD/TDMA) communications system having communication channels defined by a plurality of slots within a frame, a method of hopping wireless communication signals comprising:

assigning one of said communication signals, sequentially by frame, to at least one slot at a time of said plurality of slots such that each of said plurality of slots is assigned to said communication signal according to a predetermined slot sequence;

assigning said one of said communication signals, sequentially, to at least one frequency at a time of a plurality of frequencies such that each of said plurality of frequencies is assigned to said communication signal according to a predetermined frequency sequence; and

using said plurality of frequencies at a first site and a second site adjacent to said first site in said cellular FD/TDMA system without regard to a local partitioning among surrounding uses thereof.