Node-B/base station rake finger pooling

Details Node-B/base station rake finger pooling Node-B/base station rake finger pooling

2002-12-27

2004-08-31

Vo, Don (Department: 2681)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

06785322

ABSTRACT:

FIELD OF INVENTION
The invention generally relates to wireless code division multiple access communication systems. In particular, the invention relates to receiving user signals in such systems.
BACKGROUND
FIG. 1
is an illustration of a simplified wireless code division multiple access communication system. Each base station
20
1
-
20
4
(
20
) communicates with user equipments (UEs)
22
1
-
22
21
(
22
) in its cell
24
1
-
24
2
. To illustrate as shown in
FIG. 1
, base station
20
1
communicates with UEs
22
1
-
22
9
in its cell
24
.
Each cell
24
may also be divided into sectors
26
1
-
26
6
(
26
), such as six sectors
26
as shown in FIG.
1
. Typically, the base station
20
communicates with each sector
26
using one or multiple antennas assigned to that sector
26
. Each UE
22
in a sector
26
communicates with that sector's antennas.
The distribution of UEs
22
in a cell
24
and sector
26
as well as cell and sector loading may vary.
FIGS. 2
a
,
2
b
and
2
c
illustrate varieties in a cell and sector loading.
FIG. 2
a
illustrates a lightly loaded three sector cell with even distribution. The UEs
22
in each sector
26
are relatively even.
FIG. 2
b
illustrates a lightly loaded cell
24
with uneven UE distribution. One sector
26
3
has no users (no UEs) and one sector
26
2
has many users.
FIG. 2C
is a heavily loaded cell
24
with uneven distribution. One sector
26
3
has a few users and other sectors
26
1
and
26
2
have a large number of users. The base station/Node-B receiver preferably needs to accommodate all of these various loadings.
Furthermore, a UE
22
may move between sectors
26
, such as from sector
26
2
to sector
26
1
, as shown in FIG.
3
. One approach to transfer the handing of the UE
22
between the two sectors
26
1
and
26
2
is softer handover. In softer handover, during the transition period, the UE
22
communicates with the antennas' of both sectors
26
1
and
26
2
simultaneously. To improve signal quality during softer handover, it is desirable for the Node-B/base station receiver to accommodate the combining of the communications received by each sector
26
.
Accordingly, it is desirable to have a Node-B/base station receiver capable of handling these varying conditions.
SUMMARY
A Node-B/base station receiver comprises at least one antenna for receiving signals. Each finger of a pool of reconfigurable Rake fingers recovers a multipath component of a user and is assigned a code of the user, a code phase of the multipath component and an antenna of the at least one antenna. An antenna/Rake finger pool interface provides each finger of the Rake pool an output of the antenna assigned to that Rake finger. A combiner combines the recovered multipath components for a user to produce data of the user.


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