Method and arrangement relating to radio communication networks
First Claim
1. A method in a radio communication network (NET1;
- FIG.
1)using a combination of time division multiple access and frequency division multiple access, the network (NET1) comprising at least two radio base stations (BTS1, BTS4) and a communication unit (MS1) for radio communication with said base stations (BTS1, BTS4), the method comprising the steps of;
allocating a communication channel (CH1) dedicated for communication between a first one of said base stations (BTS1) and the communication unit (MS1), the communication channel comprising a predetermined succession of time slots (2;
FIG.
8), each time slot being associated with a predetermined radio frequency (RFC81D, RFC81U) reserved for communication on said communication channel (CH1) during said time slot (2);
characterizd by, in the communication unit (MS1),selecting at least one of said time slots (TS1);
blocking communication with said first base station (BTS1) on said dedicated communication channel (CH1) in said selected time slot (TS1);
selecting a radio frequency (FREQ4) different from the radio frequency (RFC81U) associated with said selected time slot(TS1);
receiving signals (BCCH4) from a second one of said base stations (BTS4) on the selected radio frequency (FREQ4) in said selected time slot(TS1).
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Accused Products
Abstract
The invention provides a communication unit (MS1), communicating with a first radio base station (BTS1) on a dedicated communication channel (CH1) in a radio communication network (NET1) using a combination of TDMA and FDMA, with an increased flexibility in terms of when the communication unit (MS1) can receive signals from a second base station (BTS4). The increased flexibility is achieved by the communication unit (MS1) selecting some of the time slots comprising the dedicated communication channel (CH1) and ignoring to communicate with the first radio base station in these selected time slots and instead using them to receive signals (BCCH4) from the second radio base station (BTS4). In a GSM mobile station (MS1) according to the invention, the "stolen" time slots are used for identification of a neighboring base tranceiver station (BTS4), i.e. for detection and decoding of the frequency correction channel and synchronization channel, resulting in faster identification and thus enabling the mobile station (MS1) to perform handover faster.
54 Citations
14 Claims
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1. A method in a radio communication network (NET1;
- FIG.
1)using a combination of time division multiple access and frequency division multiple access, the network (NET1) comprising at least two radio base stations (BTS1, BTS4) and a communication unit (MS1) for radio communication with said base stations (BTS1, BTS4), the method comprising the steps of;allocating a communication channel (CH1) dedicated for communication between a first one of said base stations (BTS1) and the communication unit (MS1), the communication channel comprising a predetermined succession of time slots (2;
FIG.
8), each time slot being associated with a predetermined radio frequency (RFC81D, RFC81U) reserved for communication on said communication channel (CH1) during said time slot (2);characterizd by, in the communication unit (MS1), selecting at least one of said time slots (TS1); blocking communication with said first base station (BTS1) on said dedicated communication channel (CH1) in said selected time slot (TS1); selecting a radio frequency (FREQ4) different from the radio frequency (RFC81U) associated with said selected time slot(TS1); receiving signals (BCCH4) from a second one of said base stations (BTS4) on the selected radio frequency (FREQ4) in said selected time slot(TS1). - View Dependent Claims (2, 3, 4, 5, 6, 7)
- FIG.
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8. A communication unit (MS1;
- FIG.
1) for communication with radio base stations (BTS1-BTS5) in a radio communication network (NET1) using a combination of time division multiple access and frequency division multiple access, said communication unit (MS1) comprising;communication means (703-714, 717-720, 723-724;
FIG.
7) for communication with a first one of said base stations (BTS1) on a dedicated communication channel (CH1), the communication channel (CH1) comprising a predetermined succession of time slots (2;
FIG.
8), each time slot being associated with a predetermined radio frequency (RFC81D, RFC81U) reserved for communication on said communication channel (CH1) during said time slot,characterized in that the communication unit further comprises; time slot selecting means (717-718) for selecting at least one of said time slots (TS1); communication blocking means (717-718) for blocking communication with said first base station (BTS1) in said selected time slot (TS1); radio frequency selecting means (708, 717-718) for selecting a radio frequency (FREQ4) different from said radio frequency (RFC81U) associated with said selected time slot (TS1); means (708-709, 723-724) for receiving radio signals (BCCH4) from a second one of said base stations (BTS4) on said selected radio frequency (FREQ4) in said selected time slot (TS1). - View Dependent Claims (9, 10, 11, 12, 13, 14)
- FIG.
Specification